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Finding the Fourth Proportional to 402,475.80, 603,713.70 and 215,851.80

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Solution

The fourth proportional to 402,475.80, 603,713.70 and 215,851.80 is: 323,777.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,475.80 : 603,713.70 = 215,851.80 : x
  2. Step 2: Convert to fraction form
    402,475.80/603,713.70 = 215,851.80/x
  3. Step 3: Cross multiply
    402,475.80x = 603,713.70 × 215,851.80
  4. Step 4: Simplify right side
    402,475.80x = 130,312,688,829.66
  5. Step 5: Solve for x
    x = 130,312,688,829.66/402,475.80
  6. Step 6: Final answer
    x = 323,777.70

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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.