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Finding the Fourth Proportional to 135.90, 187.56 and 89.31

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Solution

The fourth proportional to 135.90, 187.56 and 89.31 is: 123.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.90 : 187.56 = 89.31 : x
  2. Step 2: Convert to fraction form
    135.90/187.56 = 89.31/x
  3. Step 3: Cross multiply
    135.90x = 187.56 × 89.31
  4. Step 4: Simplify right side
    135.90x = 16,752.02
  5. Step 5: Solve for x
    x = 16,752.02/135.90
  6. Step 6: Final answer
    x = 123.26

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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.