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Finding the Fourth Proportional to 63.40, 87.45 and 52.47

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Solution

The fourth proportional to 63.40, 87.45 and 52.47 is: 72.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.40 : 87.45 = 52.47 : x
  2. Step 2: Convert to fraction form
    63.40/87.45 = 52.47/x
  3. Step 3: Cross multiply
    63.40x = 87.45 × 52.47
  4. Step 4: Simplify right side
    63.40x = 4,588.50
  5. Step 5: Solve for x
    x = 4,588.50/63.40
  6. Step 6: Final answer
    x = 72.37

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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.