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Finding the Fourth Proportional to 97.18, 145.58 and 53.87

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Solution

The fourth proportional to 97.18, 145.58 and 53.87 is: 80.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.18 : 145.58 = 53.87 : x
  2. Step 2: Convert to fraction form
    97.18/145.58 = 53.87/x
  3. Step 3: Cross multiply
    97.18x = 145.58 × 53.87
  4. Step 4: Simplify right side
    97.18x = 7,841.67
  5. Step 5: Solve for x
    x = 7,841.67/97.18
  6. Step 6: Final answer
    x = 80.69

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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.