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Finding the Fourth Proportional to 145.02, 217.13 and 115.86

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Solution

The fourth proportional to 145.02, 217.13 and 115.86 is: 173.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.02 : 217.13 = 115.86 : x
  2. Step 2: Convert to fraction form
    145.02/217.13 = 115.86/x
  3. Step 3: Cross multiply
    145.02x = 217.13 × 115.86
  4. Step 4: Simplify right side
    145.02x = 25,156.10
  5. Step 5: Solve for x
    x = 25,156.10/145.02
  6. Step 6: Final answer
    x = 173.47

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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.