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Finding the Fourth Proportional to 125.77, 187.90 and 79.75

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Solution

The fourth proportional to 125.77, 187.90 and 79.75 is: 119.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.77 : 187.90 = 79.75 : x
  2. Step 2: Convert to fraction form
    125.77/187.90 = 79.75/x
  3. Step 3: Cross multiply
    125.77x = 187.90 × 79.75
  4. Step 4: Simplify right side
    125.77x = 14,985.03
  5. Step 5: Solve for x
    x = 14,985.03/125.77
  6. Step 6: Final answer
    x = 119.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.