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Finding the Fourth Proportional to 58.20, 80.40 and 52.08

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Solution

The fourth proportional to 58.20, 80.40 and 52.08 is: 71.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.20 : 80.40 = 52.08 : x
  2. Step 2: Convert to fraction form
    58.20/80.40 = 52.08/x
  3. Step 3: Cross multiply
    58.20x = 80.40 × 52.08
  4. Step 4: Simplify right side
    58.20x = 4,187.23
  5. Step 5: Solve for x
    x = 4,187.23/58.20
  6. Step 6: Final answer
    x = 71.95

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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.