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Finding the Fourth Proportional to 3,990.70, 5,988.80 and 1,527.58

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Solution

The fourth proportional to 3,990.70, 5,988.80 and 1,527.58 is: 2,292.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.70 : 5,988.80 = 1,527.58 : x
  2. Step 2: Convert to fraction form
    3,990.70/5,988.80 = 1,527.58/x
  3. Step 3: Cross multiply
    3,990.70x = 5,988.80 × 1,527.58
  4. Step 4: Simplify right side
    3,990.70x = 9,148,371.10
  5. Step 5: Solve for x
    x = 9,148,371.10/3,990.70
  6. Step 6: Final answer
    x = 2,292.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.