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Finding the Fourth Proportional to 862.60, 1,189.92 and 552.28

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Solution

The fourth proportional to 862.60, 1,189.92 and 552.28 is: 761.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.60 : 1,189.92 = 552.28 : x
  2. Step 2: Convert to fraction form
    862.60/1,189.92 = 552.28/x
  3. Step 3: Cross multiply
    862.60x = 1,189.92 × 552.28
  4. Step 4: Simplify right side
    862.60x = 657,169.02
  5. Step 5: Solve for x
    x = 657,169.02/862.60
  6. Step 6: Final answer
    x = 761.85

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1.5x scale

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.