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Finding the Fourth Proportional to 515.28, 711.30 and 316.20

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Solution

The fourth proportional to 515.28, 711.30 and 316.20 is: 436.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.28 : 711.30 = 316.20 : x
  2. Step 2: Convert to fraction form
    515.28/711.30 = 316.20/x
  3. Step 3: Cross multiply
    515.28x = 711.30 × 316.20
  4. Step 4: Simplify right side
    515.28x = 224,913.06
  5. Step 5: Solve for x
    x = 224,913.06/515.28
  6. Step 6: Final answer
    x = 436.49

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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.