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Finding the Fourth Proportional to 1,540, 2,125.20 and 988.96

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Solution

The fourth proportional to 1,540, 2,125.20 and 988.96 is: 1,364.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540 : 2,125.20 = 988.96 : x
  2. Step 2: Convert to fraction form
    1,540/2,125.20 = 988.96/x
  3. Step 3: Cross multiply
    1,540x = 2,125.20 × 988.96
  4. Step 4: Simplify right side
    1,540x = 2,101,737.79
  5. Step 5: Solve for x
    x = 2,101,737.79/1,540
  6. Step 6: Final answer
    x = 1,364.76

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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.