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Finding the Fourth Proportional to 125.24, 187.89 and 56.78

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Solution

The fourth proportional to 125.24, 187.89 and 56.78 is: 85.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.24 : 187.89 = 56.78 : x
  2. Step 2: Convert to fraction form
    125.24/187.89 = 56.78/x
  3. Step 3: Cross multiply
    125.24x = 187.89 × 56.78
  4. Step 4: Simplify right side
    125.24x = 10,669.32
  5. Step 5: Solve for x
    x = 10,669.32/125.24
  6. Step 6: Final answer
    x = 85.19

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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.