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Finding the Fourth Proportional to 862.56, 1,190.58 and 642.24

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Solution

The fourth proportional to 862.56, 1,190.58 and 642.24 is: 886.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.56 : 1,190.58 = 642.24 : x
  2. Step 2: Convert to fraction form
    862.56/1,190.58 = 642.24/x
  3. Step 3: Cross multiply
    862.56x = 1,190.58 × 642.24
  4. Step 4: Simplify right side
    862.56x = 764,638.10
  5. Step 5: Solve for x
    x = 764,638.10/862.56
  6. Step 6: Final answer
    x = 886.48

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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.