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Finding the Fourth Proportional to 71.92, 99.20 and 51.16

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Solution

The fourth proportional to 71.92, 99.20 and 51.16 is: 70.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.92 : 99.20 = 51.16 : x
  2. Step 2: Convert to fraction form
    71.92/99.20 = 51.16/x
  3. Step 3: Cross multiply
    71.92x = 99.20 × 51.16
  4. Step 4: Simplify right side
    71.92x = 5,075.07
  5. Step 5: Solve for x
    x = 5,075.07/71.92
  6. Step 6: Final answer
    x = 70.57

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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.