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Finding the Fourth Proportional to 672.49, 928.35 and 448.80

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Solution

The fourth proportional to 672.49, 928.35 and 448.80 is: 619.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.49 : 928.35 = 448.80 : x
  2. Step 2: Convert to fraction form
    672.49/928.35 = 448.80/x
  3. Step 3: Cross multiply
    672.49x = 928.35 × 448.80
  4. Step 4: Simplify right side
    672.49x = 416,645.16
  5. Step 5: Solve for x
    x = 416,645.16/672.49
  6. Step 6: Final answer
    x = 619.55

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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.