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Finding the Fourth Proportional to 1,153.98, 1,729.35 and 865.62

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Solution

The fourth proportional to 1,153.98, 1,729.35 and 865.62 is: 1,297.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.98 : 1,729.35 = 865.62 : x
  2. Step 2: Convert to fraction form
    1,153.98/1,729.35 = 865.62/x
  3. Step 3: Cross multiply
    1,153.98x = 1,729.35 × 865.62
  4. Step 4: Simplify right side
    1,153.98x = 1,496,959.95
  5. Step 5: Solve for x
    x = 1,496,959.95/1,153.98
  6. Step 6: Final answer
    x = 1,297.21

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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.