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Finding the Fourth Proportional to 643,306.76, 887,756.86 and 356,819.48

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Solution

The fourth proportional to 643,306.76, 887,756.86 and 356,819.48 is: 492,407.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,306.76 : 887,756.86 = 356,819.48 : x
  2. Step 2: Convert to fraction form
    643,306.76/887,756.86 = 356,819.48/x
  3. Step 3: Cross multiply
    643,306.76x = 887,756.86 × 356,819.48
  4. Step 4: Simplify right side
    643,306.76x = 316,768,940,487.96
  5. Step 5: Solve for x
    x = 316,768,940,487.96/643,306.76
  6. Step 6: Final answer
    x = 492,407.29

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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.