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Finding the Fourth Proportional to 645,436.72, 967,990.56 and 457,660.90

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Solution

The fourth proportional to 645,436.72, 967,990.56 and 457,660.90 is: 686,374.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,436.72 : 967,990.56 = 457,660.90 : x
  2. Step 2: Convert to fraction form
    645,436.72/967,990.56 = 457,660.90/x
  3. Step 3: Cross multiply
    645,436.72x = 967,990.56 × 457,660.90
  4. Step 4: Simplify right side
    645,436.72x = 443,011,430,881.10
  5. Step 5: Solve for x
    x = 443,011,430,881.10/645,436.72
  6. Step 6: Final answer
    x = 686,374.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.