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Finding the Fourth Proportional to 125.35, 187.90 and 84.78

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Solution

The fourth proportional to 125.35, 187.90 and 84.78 is: 127.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.35 : 187.90 = 84.78 : x
  2. Step 2: Convert to fraction form
    125.35/187.90 = 84.78/x
  3. Step 3: Cross multiply
    125.35x = 187.90 × 84.78
  4. Step 4: Simplify right side
    125.35x = 15,929.01
  5. Step 5: Solve for x
    x = 15,929.01/125.35
  6. Step 6: Final answer
    x = 127.08

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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.