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Finding the Fourth Proportional to 667,699.28, 921,417.16 and 361,769.68

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Solution

The fourth proportional to 667,699.28, 921,417.16 and 361,769.68 is: 499,237.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,699.28 : 921,417.16 = 361,769.68 : x
  2. Step 2: Convert to fraction form
    667,699.28/921,417.16 = 361,769.68/x
  3. Step 3: Cross multiply
    667,699.28x = 921,417.16 × 361,769.68
  4. Step 4: Simplify right side
    667,699.28x = 333,340,791,119.71
  5. Step 5: Solve for x
    x = 333,340,791,119.71/667,699.28
  6. Step 6: Final answer
    x = 499,237.91

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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.