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Finding the Fourth Proportional to 57.61, 86.40 and 21.53

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Solution

The fourth proportional to 57.61, 86.40 and 21.53 is: 32.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.61 : 86.40 = 21.53 : x
  2. Step 2: Convert to fraction form
    57.61/86.40 = 21.53/x
  3. Step 3: Cross multiply
    57.61x = 86.40 × 21.53
  4. Step 4: Simplify right side
    57.61x = 1,860.41
  5. Step 5: Solve for x
    x = 1,860.41/57.61
  6. Step 6: Final answer
    x = 32.29

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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.