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Finding the Fourth Proportional to 1,392.40, 2,089.20 and 708.40

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Solution

The fourth proportional to 1,392.40, 2,089.20 and 708.40 is: 1,062.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.40 : 2,089.20 = 708.40 : x
  2. Step 2: Convert to fraction form
    1,392.40/2,089.20 = 708.40/x
  3. Step 3: Cross multiply
    1,392.40x = 2,089.20 × 708.40
  4. Step 4: Simplify right side
    1,392.40x = 1,479,989.28
  5. Step 5: Solve for x
    x = 1,479,989.28/1,392.40
  6. Step 6: Final answer
    x = 1,062.91

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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.