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Finding the Fourth Proportional to 125.72, 188.64 and 53.63

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Solution

The fourth proportional to 125.72, 188.64 and 53.63 is: 80.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.72 : 188.64 = 53.63 : x
  2. Step 2: Convert to fraction form
    125.72/188.64 = 53.63/x
  3. Step 3: Cross multiply
    125.72x = 188.64 × 53.63
  4. Step 4: Simplify right side
    125.72x = 10,115.82
  5. Step 5: Solve for x
    x = 10,115.82/125.72
  6. Step 6: Final answer
    x = 80.47

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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.