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Finding the Fourth Proportional to 515.30, 711.11 and 318.76

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Solution

The fourth proportional to 515.30, 711.11 and 318.76 is: 439.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.30 : 711.11 = 318.76 : x
  2. Step 2: Convert to fraction form
    515.30/711.11 = 318.76/x
  3. Step 3: Cross multiply
    515.30x = 711.11 × 318.76
  4. Step 4: Simplify right side
    515.30x = 226,668.27
  5. Step 5: Solve for x
    x = 226,668.27/515.30
  6. Step 6: Final answer
    x = 439.88

Related Problems

Find fourth proportional to 257.65, 355.55 and 159.38
Half scale
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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.