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Finding the Fourth Proportional to 680,920.80, 1,021,381.20 and 415,200.30

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Solution

The fourth proportional to 680,920.80, 1,021,381.20 and 415,200.30 is: 622,800.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,920.80 : 1,021,381.20 = 415,200.30 : x
  2. Step 2: Convert to fraction form
    680,920.80/1,021,381.20 = 415,200.30/x
  3. Step 3: Cross multiply
    680,920.80x = 1,021,381.20 × 415,200.30
  4. Step 4: Simplify right side
    680,920.80x = 424,077,780,654.36
  5. Step 5: Solve for x
    x = 424,077,780,654.36/680,920.80
  6. Step 6: Final answer
    x = 622,800.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.