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Finding the Fourth Proportional to 42.61, 58.80 and 23.20

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Solution

The fourth proportional to 42.61, 58.80 and 23.20 is: 32.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.61 : 58.80 = 23.20 : x
  2. Step 2: Convert to fraction form
    42.61/58.80 = 23.20/x
  3. Step 3: Cross multiply
    42.61x = 58.80 × 23.20
  4. Step 4: Simplify right side
    42.61x = 1,364.37
  5. Step 5: Solve for x
    x = 1,364.37/42.61
  6. Step 6: Final answer
    x = 32.02

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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.