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Finding the Fourth Proportional to 97.02, 145.20 and 77.66

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Solution

The fourth proportional to 97.02, 145.20 and 77.66 is: 116.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.02 : 145.20 = 77.66 : x
  2. Step 2: Convert to fraction form
    97.02/145.20 = 77.66/x
  3. Step 3: Cross multiply
    97.02x = 145.20 × 77.66
  4. Step 4: Simplify right side
    97.02x = 11,276.23
  5. Step 5: Solve for x
    x = 11,276.23/97.02
  6. Step 6: Final answer
    x = 116.23

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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.