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Finding the Fourth Proportional to 61.65, 91.80 and 59.01

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Solution

The fourth proportional to 61.65, 91.80 and 59.01 is: 87.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.65 : 91.80 = 59.01 : x
  2. Step 2: Convert to fraction form
    61.65/91.80 = 59.01/x
  3. Step 3: Cross multiply
    61.65x = 91.80 × 59.01
  4. Step 4: Simplify right side
    61.65x = 5,417.12
  5. Step 5: Solve for x
    x = 5,417.12/61.65
  6. Step 6: Final answer
    x = 87.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.