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Finding the Fourth Proportional to 61.74, 91.62 and 61.02

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Solution

The fourth proportional to 61.74, 91.62 and 61.02 is: 90.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.74 : 91.62 = 61.02 : x
  2. Step 2: Convert to fraction form
    61.74/91.62 = 61.02/x
  3. Step 3: Cross multiply
    61.74x = 91.62 × 61.02
  4. Step 4: Simplify right side
    61.74x = 5,590.65
  5. Step 5: Solve for x
    x = 5,590.65/61.74
  6. Step 6: Final answer
    x = 90.55

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.