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Finding the Fourth Proportional to 671.25, 926.12 and 387.63

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Solution

The fourth proportional to 671.25, 926.12 and 387.63 is: 534.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.25 : 926.12 = 387.63 : x
  2. Step 2: Convert to fraction form
    671.25/926.12 = 387.63/x
  3. Step 3: Cross multiply
    671.25x = 926.12 × 387.63
  4. Step 4: Simplify right side
    671.25x = 358,992.27
  5. Step 5: Solve for x
    x = 358,992.27/671.25
  6. Step 6: Final answer
    x = 534.81

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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.