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Finding the Fourth Proportional to 614.30, 921.49 and 512.31

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Solution

The fourth proportional to 614.30, 921.49 and 512.31 is: 768.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.30 : 921.49 = 512.31 : x
  2. Step 2: Convert to fraction form
    614.30/921.49 = 512.31/x
  3. Step 3: Cross multiply
    614.30x = 921.49 × 512.31
  4. Step 4: Simplify right side
    614.30x = 472,088.54
  5. Step 5: Solve for x
    x = 472,088.54/614.30
  6. Step 6: Final answer
    x = 768.50

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.