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Finding the Fourth Proportional to 125.31, 187.90 and 53.13

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Solution

The fourth proportional to 125.31, 187.90 and 53.13 is: 79.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.31 : 187.90 = 53.13 : x
  2. Step 2: Convert to fraction form
    125.31/187.90 = 53.13/x
  3. Step 3: Cross multiply
    125.31x = 187.90 × 53.13
  4. Step 4: Simplify right side
    125.31x = 9,983.13
  5. Step 5: Solve for x
    x = 9,983.13/125.31
  6. Step 6: Final answer
    x = 79.67

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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.