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Finding the Fourth Proportional to 515.10, 710.96 and 318.76

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Solution

The fourth proportional to 515.10, 710.96 and 318.76 is: 439.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.10 : 710.96 = 318.76 : x
  2. Step 2: Convert to fraction form
    515.10/710.96 = 318.76/x
  3. Step 3: Cross multiply
    515.10x = 710.96 × 318.76
  4. Step 4: Simplify right side
    515.10x = 226,625.61
  5. Step 5: Solve for x
    x = 226,625.61/515.10
  6. Step 6: Final answer
    x = 439.96

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Find fourth proportional to 257.55, 355.48 and 159.38
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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.