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Finding the Fourth Proportional to 671.84, 928.32 and 485.92

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Solution

The fourth proportional to 671.84, 928.32 and 485.92 is: 671.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.84 : 928.32 = 485.92 : x
  2. Step 2: Convert to fraction form
    671.84/928.32 = 485.92/x
  3. Step 3: Cross multiply
    671.84x = 928.32 × 485.92
  4. Step 4: Simplify right side
    671.84x = 451,089.25
  5. Step 5: Solve for x
    x = 451,089.25/671.84
  6. Step 6: Final answer
    x = 671.42

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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.