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Finding the Fourth Proportional to 672.80, 1,013.79 and 553.74

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Solution

The fourth proportional to 672.80, 1,013.79 and 553.74 is: 834.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.80 : 1,013.79 = 553.74 : x
  2. Step 2: Convert to fraction form
    672.80/1,013.79 = 553.74/x
  3. Step 3: Cross multiply
    672.80x = 1,013.79 × 553.74
  4. Step 4: Simplify right side
    672.80x = 561,376.07
  5. Step 5: Solve for x
    x = 561,376.07/672.80
  6. Step 6: Final answer
    x = 834.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.