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Finding the Fourth Proportional to 1,079.65, 1,489.62 and 625.24

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Solution

The fourth proportional to 1,079.65, 1,489.62 and 625.24 is: 862.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.65 : 1,489.62 = 625.24 : x
  2. Step 2: Convert to fraction form
    1,079.65/1,489.62 = 625.24/x
  3. Step 3: Cross multiply
    1,079.65x = 1,489.62 × 625.24
  4. Step 4: Simplify right side
    1,079.65x = 931,370.01
  5. Step 5: Solve for x
    x = 931,370.01/1,079.65
  6. Step 6: Final answer
    x = 862.66

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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.