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Finding the Fourth Proportional to 1,129.88, 1,559.34 and 632.56

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Solution

The fourth proportional to 1,129.88, 1,559.34 and 632.56 is: 872.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.88 : 1,559.34 = 632.56 : x
  2. Step 2: Convert to fraction form
    1,129.88/1,559.34 = 632.56/x
  3. Step 3: Cross multiply
    1,129.88x = 1,559.34 × 632.56
  4. Step 4: Simplify right side
    1,129.88x = 986,376.11
  5. Step 5: Solve for x
    x = 986,376.11/1,129.88
  6. Step 6: Final answer
    x = 872.99

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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.