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Finding the Fourth Proportional to 720,650,480.76, 994,471,010.82 and 390,618,533.88

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Solution

The fourth proportional to 720,650,480.76, 994,471,010.82 and 390,618,533.88 is: 539,039,130.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,650,480.76 : 994,471,010.82 = 390,618,533.88 : x
  2. Step 2: Convert to fraction form
    720,650,480.76/994,471,010.82 = 390,618,533.88/x
  3. Step 3: Cross multiply
    720,650,480.76x = 994,471,010.82 × 390,618,533.88
  4. Step 4: Simplify right side
    720,650,480.76x = 388,458,808,232,670,016
  5. Step 5: Solve for x
    x = 388,458,808,232,670,016/720,650,480.76
  6. Step 6: Final answer
    x = 539,039,130.07

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.