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Finding the Fourth Proportional to 1,142.32, 1,713.12 and 492.88

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Solution

The fourth proportional to 1,142.32, 1,713.12 and 492.88 is: 739.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.32 : 1,713.12 = 492.88 : x
  2. Step 2: Convert to fraction form
    1,142.32/1,713.12 = 492.88/x
  3. Step 3: Cross multiply
    1,142.32x = 1,713.12 × 492.88
  4. Step 4: Simplify right side
    1,142.32x = 844,362.59
  5. Step 5: Solve for x
    x = 844,362.59/1,142.32
  6. Step 6: Final answer
    x = 739.16

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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.