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Finding the Fourth Proportional to 1,342.28, 1,851.14 and 869.71

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Solution

The fourth proportional to 1,342.28, 1,851.14 and 869.71 is: 1,199.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.28 : 1,851.14 = 869.71 : x
  2. Step 2: Convert to fraction form
    1,342.28/1,851.14 = 869.71/x
  3. Step 3: Cross multiply
    1,342.28x = 1,851.14 × 869.71
  4. Step 4: Simplify right side
    1,342.28x = 1,609,959.97
  5. Step 5: Solve for x
    x = 1,609,959.97/1,342.28
  6. Step 6: Final answer
    x = 1,199.42

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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.