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Finding the Fourth Proportional to 680,305.13, 938,609.72 and 385,906.33

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Solution

The fourth proportional to 680,305.13, 938,609.72 and 385,906.33 is: 532,430.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,305.13 : 938,609.72 = 385,906.33 : x
  2. Step 2: Convert to fraction form
    680,305.13/938,609.72 = 385,906.33/x
  3. Step 3: Cross multiply
    680,305.13x = 938,609.72 × 385,906.33
  4. Step 4: Simplify right side
    680,305.13x = 362,215,432,347.53
  5. Step 5: Solve for x
    x = 362,215,432,347.53/680,305.13
  6. Step 6: Final answer
    x = 532,430.84

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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.