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Finding the Fourth Proportional to 1,146.32, 1,721.50 and 853.90

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Solution

The fourth proportional to 1,146.32, 1,721.50 and 853.90 is: 1,282.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.32 : 1,721.50 = 853.90 : x
  2. Step 2: Convert to fraction form
    1,146.32/1,721.50 = 853.90/x
  3. Step 3: Cross multiply
    1,146.32x = 1,721.50 × 853.90
  4. Step 4: Simplify right side
    1,146.32x = 1,469,988.85
  5. Step 5: Solve for x
    x = 1,469,988.85/1,146.32
  6. Step 6: Final answer
    x = 1,282.35

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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.