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Finding the Fourth Proportional to 888.72, 1,333.87 and 478.15

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Solution

The fourth proportional to 888.72, 1,333.87 and 478.15 is: 717.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.72 : 1,333.87 = 478.15 : x
  2. Step 2: Convert to fraction form
    888.72/1,333.87 = 478.15/x
  3. Step 3: Cross multiply
    888.72x = 1,333.87 × 478.15
  4. Step 4: Simplify right side
    888.72x = 637,792.91
  5. Step 5: Solve for x
    x = 637,792.91/888.72
  6. Step 6: Final answer
    x = 717.65

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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.