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Finding the Fourth Proportional to 48.61, 72.87 and 21.55

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Solution

The fourth proportional to 48.61, 72.87 and 21.55 is: 32.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.61 : 72.87 = 21.55 : x
  2. Step 2: Convert to fraction form
    48.61/72.87 = 21.55/x
  3. Step 3: Cross multiply
    48.61x = 72.87 × 21.55
  4. Step 4: Simplify right side
    48.61x = 1,570.35
  5. Step 5: Solve for x
    x = 1,570.35/48.61
  6. Step 6: Final answer
    x = 32.31

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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.