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Finding the Fourth Proportional to 680,710.92, 939,469.14 and 390,435.72

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Solution

The fourth proportional to 680,710.92, 939,469.14 and 390,435.72 is: 538,851.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,710.92 : 939,469.14 = 390,435.72 : x
  2. Step 2: Convert to fraction form
    680,710.92/939,469.14 = 390,435.72/x
  3. Step 3: Cross multiply
    680,710.92x = 939,469.14 × 390,435.72
  4. Step 4: Simplify right side
    680,710.92x = 366,802,310,093.68
  5. Step 5: Solve for x
    x = 366,802,310,093.68/680,710.92
  6. Step 6: Final answer
    x = 538,851.81

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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.