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Finding the Fourth Proportional to 1,129.01, 1,558.10 and 631.68

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Solution

The fourth proportional to 1,129.01, 1,558.10 and 631.68 is: 871.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.01 : 1,558.10 = 631.68 : x
  2. Step 2: Convert to fraction form
    1,129.01/1,558.10 = 631.68/x
  3. Step 3: Cross multiply
    1,129.01x = 1,558.10 × 631.68
  4. Step 4: Simplify right side
    1,129.01x = 984,217.45
  5. Step 5: Solve for x
    x = 984,217.45/1,129.01
  6. Step 6: Final answer
    x = 871.76

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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.