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Finding the Fourth Proportional to 1,080.76, 1,489.98 and 869.08

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Solution

The fourth proportional to 1,080.76, 1,489.98 and 869.08 is: 1,198.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.76 : 1,489.98 = 869.08 : x
  2. Step 2: Convert to fraction form
    1,080.76/1,489.98 = 869.08/x
  3. Step 3: Cross multiply
    1,080.76x = 1,489.98 × 869.08
  4. Step 4: Simplify right side
    1,080.76x = 1,294,911.82
  5. Step 5: Solve for x
    x = 1,294,911.82/1,080.76
  6. Step 6: Final answer
    x = 1,198.15

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Double scale
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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.