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Finding the Fourth Proportional to 642,123.60, 886,145.31 and 351,762.90

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Solution

The fourth proportional to 642,123.60, 886,145.31 and 351,762.90 is: 485,440.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,123.60 : 886,145.31 = 351,762.90 : x
  2. Step 2: Convert to fraction form
    642,123.60/886,145.31 = 351,762.90/x
  3. Step 3: Cross multiply
    642,123.60x = 886,145.31 × 351,762.90
  4. Step 4: Simplify right side
    642,123.60x = 311,713,044,067.00
  5. Step 5: Solve for x
    x = 311,713,044,067.00/642,123.60
  6. Step 6: Final answer
    x = 485,440.88

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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.