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Finding the Fourth Proportional to 643,430.34, 887,934.92 and 356,950.44

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Solution

The fourth proportional to 643,430.34, 887,934.92 and 356,950.44 is: 492,592.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,430.34 : 887,934.92 = 356,950.44 : x
  2. Step 2: Convert to fraction form
    643,430.34/887,934.92 = 356,950.44/x
  3. Step 3: Cross multiply
    643,430.34x = 887,934.92 × 356,950.44
  4. Step 4: Simplify right side
    643,430.34x = 316,948,758,600.61
  5. Step 5: Solve for x
    x = 316,948,758,600.61/643,430.34
  6. Step 6: Final answer
    x = 492,592.19

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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.