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Finding the Fourth Proportional to 1,029.28, 1,419.78 and 630.76

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Solution

The fourth proportional to 1,029.28, 1,419.78 and 630.76 is: 870.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.28 : 1,419.78 = 630.76 : x
  2. Step 2: Convert to fraction form
    1,029.28/1,419.78 = 630.76/x
  3. Step 3: Cross multiply
    1,029.28x = 1,419.78 × 630.76
  4. Step 4: Simplify right side
    1,029.28x = 895,540.43
  5. Step 5: Solve for x
    x = 895,540.43/1,029.28
  6. Step 6: Final answer
    x = 870.06

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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.