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Finding the Fourth Proportional to 1,348.42, 2,020.80 and 653.72

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Solution

The fourth proportional to 1,348.42, 2,020.80 and 653.72 is: 979.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,348.42 : 2,020.80 = 653.72 : x
  2. Step 2: Convert to fraction form
    1,348.42/2,020.80 = 653.72/x
  3. Step 3: Cross multiply
    1,348.42x = 2,020.80 × 653.72
  4. Step 4: Simplify right side
    1,348.42x = 1,321,037.41
  5. Step 5: Solve for x
    x = 1,321,037.41/1,348.42
  6. Step 6: Final answer
    x = 979.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.