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Finding the Fourth Proportional to 62.90, 86.68 and 47.35

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Solution

The fourth proportional to 62.90, 86.68 and 47.35 is: 65.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.90 : 86.68 = 47.35 : x
  2. Step 2: Convert to fraction form
    62.90/86.68 = 47.35/x
  3. Step 3: Cross multiply
    62.90x = 86.68 × 47.35
  4. Step 4: Simplify right side
    62.90x = 4,104.17
  5. Step 5: Solve for x
    x = 4,104.17/62.90
  6. Step 6: Final answer
    x = 65.25

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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.