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Finding the Fourth Proportional to 1,079.55, 1,489.65 and 681.06

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Solution

The fourth proportional to 1,079.55, 1,489.65 and 681.06 is: 939.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.55 : 1,489.65 = 681.06 : x
  2. Step 2: Convert to fraction form
    1,079.55/1,489.65 = 681.06/x
  3. Step 3: Cross multiply
    1,079.55x = 1,489.65 × 681.06
  4. Step 4: Simplify right side
    1,079.55x = 1,014,545.34
  5. Step 5: Solve for x
    x = 1,014,545.34/1,079.55
  6. Step 6: Final answer
    x = 939.78

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1.5x scale

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.