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Finding the Fourth Proportional to 643,290.12, 887,780.64 and 371,407.86

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Solution

The fourth proportional to 643,290.12, 887,780.64 and 371,407.86 is: 512,566.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,290.12 : 887,780.64 = 371,407.86 : x
  2. Step 2: Convert to fraction form
    643,290.12/887,780.64 = 371,407.86/x
  3. Step 3: Cross multiply
    643,290.12x = 887,780.64 × 371,407.86
  4. Step 4: Simplify right side
    643,290.12x = 329,728,707,651.83
  5. Step 5: Solve for x
    x = 329,728,707,651.83/643,290.12
  6. Step 6: Final answer
    x = 512,566.10

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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.