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Finding the Fourth Proportional to 82.04, 123.08 and 53.18

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Solution

The fourth proportional to 82.04, 123.08 and 53.18 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.04 : 123.08 = 53.18 : x
  2. Step 2: Convert to fraction form
    82.04/123.08 = 53.18/x
  3. Step 3: Cross multiply
    82.04x = 123.08 × 53.18
  4. Step 4: Simplify right side
    82.04x = 6,545.39
  5. Step 5: Solve for x
    x = 6,545.39/82.04
  6. Step 6: Final answer
    x = 79.78

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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.