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Finding the Fourth Proportional to 643,339.77, 887,915.17 and 356,952.12

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Solution

The fourth proportional to 643,339.77, 887,915.17 and 356,952.12 is: 492,652.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,339.77 : 887,915.17 = 356,952.12 : x
  2. Step 2: Convert to fraction form
    643,339.77/887,915.17 = 356,952.12/x
  3. Step 3: Cross multiply
    643,339.77x = 887,915.17 × 356,952.12
  4. Step 4: Simplify right side
    643,339.77x = 316,943,197,420.31
  5. Step 5: Solve for x
    x = 316,943,197,420.31/643,339.77
  6. Step 6: Final answer
    x = 492,652.89

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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.