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Finding the Fourth Proportional to 145.15, 217.54 and 76.53

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Solution

The fourth proportional to 145.15, 217.54 and 76.53 is: 114.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.15 : 217.54 = 76.53 : x
  2. Step 2: Convert to fraction form
    145.15/217.54 = 76.53/x
  3. Step 3: Cross multiply
    145.15x = 217.54 × 76.53
  4. Step 4: Simplify right side
    145.15x = 16,648.34
  5. Step 5: Solve for x
    x = 16,648.34/145.15
  6. Step 6: Final answer
    x = 114.70

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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.