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Finding the Fourth Proportional to 1,124.64, 1,686.96 and 713.20

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Solution

The fourth proportional to 1,124.64, 1,686.96 and 713.20 is: 1,069.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.64 : 1,686.96 = 713.20 : x
  2. Step 2: Convert to fraction form
    1,124.64/1,686.96 = 713.20/x
  3. Step 3: Cross multiply
    1,124.64x = 1,686.96 × 713.20
  4. Step 4: Simplify right side
    1,124.64x = 1,203,139.87
  5. Step 5: Solve for x
    x = 1,203,139.87/1,124.64
  6. Step 6: Final answer
    x = 1,069.80

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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.