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Finding the Fourth Proportional to 63.90, 88.15 and 40.58

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Solution

The fourth proportional to 63.90, 88.15 and 40.58 is: 55.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.90 : 88.15 = 40.58 : x
  2. Step 2: Convert to fraction form
    63.90/88.15 = 40.58/x
  3. Step 3: Cross multiply
    63.90x = 88.15 × 40.58
  4. Step 4: Simplify right side
    63.90x = 3,577.13
  5. Step 5: Solve for x
    x = 3,577.13/63.90
  6. Step 6: Final answer
    x = 55.98

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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.