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Finding the Fourth Proportional to 88.78, 133.05 and 56.66

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Solution

The fourth proportional to 88.78, 133.05 and 56.66 is: 84.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.78 : 133.05 = 56.66 : x
  2. Step 2: Convert to fraction form
    88.78/133.05 = 56.66/x
  3. Step 3: Cross multiply
    88.78x = 133.05 × 56.66
  4. Step 4: Simplify right side
    88.78x = 7,538.61
  5. Step 5: Solve for x
    x = 7,538.61/88.78
  6. Step 6: Final answer
    x = 84.91

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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.