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Finding the Fourth Proportional to 798.72, 1,102.20 and 449.40

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Solution

The fourth proportional to 798.72, 1,102.20 and 449.40 is: 620.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.72 : 1,102.20 = 449.40 : x
  2. Step 2: Convert to fraction form
    798.72/1,102.20 = 449.40/x
  3. Step 3: Cross multiply
    798.72x = 1,102.20 × 449.40
  4. Step 4: Simplify right side
    798.72x = 495,328.68
  5. Step 5: Solve for x
    x = 495,328.68/798.72
  6. Step 6: Final answer
    x = 620.15

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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.