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Finding the Fourth Proportional to 125.08, 187.40 and 86.80

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Solution

The fourth proportional to 125.08, 187.40 and 86.80 is: 130.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.08 : 187.40 = 86.80 : x
  2. Step 2: Convert to fraction form
    125.08/187.40 = 86.80/x
  3. Step 3: Cross multiply
    125.08x = 187.40 × 86.80
  4. Step 4: Simplify right side
    125.08x = 16,266.32
  5. Step 5: Solve for x
    x = 16,266.32/125.08
  6. Step 6: Final answer
    x = 130.05

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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.