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Finding the Fourth Proportional to 921.13, 1,270.84 and 522.75

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Solution

The fourth proportional to 921.13, 1,270.84 and 522.75 is: 721.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.13 : 1,270.84 = 522.75 : x
  2. Step 2: Convert to fraction form
    921.13/1,270.84 = 522.75/x
  3. Step 3: Cross multiply
    921.13x = 1,270.84 × 522.75
  4. Step 4: Simplify right side
    921.13x = 664,331.61
  5. Step 5: Solve for x
    x = 664,331.61/921.13
  6. Step 6: Final answer
    x = 721.21

Related Problems

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Half scale
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Double scale
Find fourth proportional to 922.13, 1,272.22 and 523.75
Similar ratio
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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.