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Finding the Fourth Proportional to 1,440.97, 1,988.80 and 1,129.93

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Solution

The fourth proportional to 1,440.97, 1,988.80 and 1,129.93 is: 1,559.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.97 : 1,988.80 = 1,129.93 : x
  2. Step 2: Convert to fraction form
    1,440.97/1,988.80 = 1,129.93/x
  3. Step 3: Cross multiply
    1,440.97x = 1,988.80 × 1,129.93
  4. Step 4: Simplify right side
    1,440.97x = 2,247,211.17
  5. Step 5: Solve for x
    x = 2,247,211.17/1,440.97
  6. Step 6: Final answer
    x = 1,559.51

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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.