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Finding the Fourth Proportional to 515.45, 710.95 and 316.29

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Solution

The fourth proportional to 515.45, 710.95 and 316.29 is: 436.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.45 : 710.95 = 316.29 : x
  2. Step 2: Convert to fraction form
    515.45/710.95 = 316.29/x
  3. Step 3: Cross multiply
    515.45x = 710.95 × 316.29
  4. Step 4: Simplify right side
    515.45x = 224,865.73
  5. Step 5: Solve for x
    x = 224,865.73/515.45
  6. Step 6: Final answer
    x = 436.25

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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.