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Finding the Fourth Proportional to 1,079.26, 1,487.87 and 912.80

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Solution

The fourth proportional to 1,079.26, 1,487.87 and 912.80 is: 1,258.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.26 : 1,487.87 = 912.80 : x
  2. Step 2: Convert to fraction form
    1,079.26/1,487.87 = 912.80/x
  3. Step 3: Cross multiply
    1,079.26x = 1,487.87 × 912.80
  4. Step 4: Simplify right side
    1,079.26x = 1,358,130.31
  5. Step 5: Solve for x
    x = 1,358,130.31/1,079.26
  6. Step 6: Final answer
    x = 1,258.39

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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.