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Finding the Fourth Proportional to 140.62, 210.88 and 53.91

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Solution

The fourth proportional to 140.62, 210.88 and 53.91 is: 80.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.62 : 210.88 = 53.91 : x
  2. Step 2: Convert to fraction form
    140.62/210.88 = 53.91/x
  3. Step 3: Cross multiply
    140.62x = 210.88 × 53.91
  4. Step 4: Simplify right side
    140.62x = 11,368.76
  5. Step 5: Solve for x
    x = 11,368.76/140.62
  6. Step 6: Final answer
    x = 80.85

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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.