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Finding the Fourth Proportional to 61.89, 85.49 and 56.53

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Solution

The fourth proportional to 61.89, 85.49 and 56.53 is: 78.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.89 : 85.49 = 56.53 : x
  2. Step 2: Convert to fraction form
    61.89/85.49 = 56.53/x
  3. Step 3: Cross multiply
    61.89x = 85.49 × 56.53
  4. Step 4: Simplify right side
    61.89x = 4,832.68
  5. Step 5: Solve for x
    x = 4,832.68/61.89
  6. Step 6: Final answer
    x = 78.08

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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.