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Finding the Fourth Proportional to 1,253.16, 1,729.02 and 860.28

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Solution

The fourth proportional to 1,253.16, 1,729.02 and 860.28 is: 1,186.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.16 : 1,729.02 = 860.28 : x
  2. Step 2: Convert to fraction form
    1,253.16/1,729.02 = 860.28/x
  3. Step 3: Cross multiply
    1,253.16x = 1,729.02 × 860.28
  4. Step 4: Simplify right side
    1,253.16x = 1,487,441.33
  5. Step 5: Solve for x
    x = 1,487,441.33/1,253.16
  6. Step 6: Final answer
    x = 1,186.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.