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Finding the Fourth Proportional to 1,129.93, 1,559.31 and 632.57

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Solution

The fourth proportional to 1,129.93, 1,559.31 and 632.57 is: 872.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.93 : 1,559.31 = 632.57 : x
  2. Step 2: Convert to fraction form
    1,129.93/1,559.31 = 632.57/x
  3. Step 3: Cross multiply
    1,129.93x = 1,559.31 × 632.57
  4. Step 4: Simplify right side
    1,129.93x = 986,374.25
  5. Step 5: Solve for x
    x = 986,374.25/1,129.93
  6. Step 6: Final answer
    x = 872.95

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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.