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Finding the Fourth Proportional to 690,396.72, 952,720.90 and 384,486

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Solution

The fourth proportional to 690,396.72, 952,720.90 and 384,486 is: 530,575.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    690,396.72 : 952,720.90 = 384,486 : x
  2. Step 2: Convert to fraction form
    690,396.72/952,720.90 = 384,486/x
  3. Step 3: Cross multiply
    690,396.72x = 952,720.90 × 384,486
  4. Step 4: Simplify right side
    690,396.72x = 366,307,847,957.40
  5. Step 5: Solve for x
    x = 366,307,847,957.40/690,396.72
  6. Step 6: Final answer
    x = 530,575.88

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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.