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Finding the Fourth Proportional to 77.16, 106.53 and 72.53

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Solution

The fourth proportional to 77.16, 106.53 and 72.53 is: 100.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.16 : 106.53 = 72.53 : x
  2. Step 2: Convert to fraction form
    77.16/106.53 = 72.53/x
  3. Step 3: Cross multiply
    77.16x = 106.53 × 72.53
  4. Step 4: Simplify right side
    77.16x = 7,726.09
  5. Step 5: Solve for x
    x = 7,726.09/77.16
  6. Step 6: Final answer
    x = 100.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.