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Finding the Fourth Proportional to 145.72, 218.08 and 84.76

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Solution

The fourth proportional to 145.72, 218.08 and 84.76 is: 126.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.72 : 218.08 = 84.76 : x
  2. Step 2: Convert to fraction form
    145.72/218.08 = 84.76/x
  3. Step 3: Cross multiply
    145.72x = 218.08 × 84.76
  4. Step 4: Simplify right side
    145.72x = 18,484.46
  5. Step 5: Solve for x
    x = 18,484.46/145.72
  6. Step 6: Final answer
    x = 126.85

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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.