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Finding the Fourth Proportional to 510.28, 704.19 and 311.29

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Solution

The fourth proportional to 510.28, 704.19 and 311.29 is: 429.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.28 : 704.19 = 311.29 : x
  2. Step 2: Convert to fraction form
    510.28/704.19 = 311.29/x
  3. Step 3: Cross multiply
    510.28x = 704.19 × 311.29
  4. Step 4: Simplify right side
    510.28x = 219,207.31
  5. Step 5: Solve for x
    x = 219,207.31/510.28
  6. Step 6: Final answer
    x = 429.58

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.