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Finding the Fourth Proportional to 672.75, 928.44 and 448.30

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Solution

The fourth proportional to 672.75, 928.44 and 448.30 is: 618.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.75 : 928.44 = 448.30 : x
  2. Step 2: Convert to fraction form
    672.75/928.44 = 448.30/x
  3. Step 3: Cross multiply
    672.75x = 928.44 × 448.30
  4. Step 4: Simplify right side
    672.75x = 416,219.65
  5. Step 5: Solve for x
    x = 416,219.65/672.75
  6. Step 6: Final answer
    x = 618.68

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Find fourth proportional to 336.38, 464.22 and 224.15
Half scale
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Double scale
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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.