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Finding the Fourth Proportional to 680,584.32, 939,295.44 and 390,309.60

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Solution

The fourth proportional to 680,584.32, 939,295.44 and 390,309.60 is: 538,678.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,584.32 : 939,295.44 = 390,309.60 : x
  2. Step 2: Convert to fraction form
    680,584.32/939,295.44 = 390,309.60/x
  3. Step 3: Cross multiply
    680,584.32x = 939,295.44 × 390,309.60
  4. Step 4: Simplify right side
    680,584.32x = 366,616,027,468.22
  5. Step 5: Solve for x
    x = 366,616,027,468.22/680,584.32
  6. Step 6: Final answer
    x = 538,678.33

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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.