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Finding the Fourth Proportional to 659,890.63, 910,639.33 and 387,989.11

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Solution

The fourth proportional to 659,890.63, 910,639.33 and 387,989.11 is: 535,419.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,890.63 : 910,639.33 = 387,989.11 : x
  2. Step 2: Convert to fraction form
    659,890.63/910,639.33 = 387,989.11/x
  3. Step 3: Cross multiply
    659,890.63x = 910,639.33 × 387,989.11
  4. Step 4: Simplify right side
    659,890.63x = 353,318,143,177.70
  5. Step 5: Solve for x
    x = 353,318,143,177.70/659,890.63
  6. Step 6: Final answer
    x = 535,419.25

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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.