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Finding the Fourth Proportional to 515.18, 710.69 and 328.48

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Solution

The fourth proportional to 515.18, 710.69 and 328.48 is: 453.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.18 : 710.69 = 328.48 : x
  2. Step 2: Convert to fraction form
    515.18/710.69 = 328.48/x
  3. Step 3: Cross multiply
    515.18x = 710.69 × 328.48
  4. Step 4: Simplify right side
    515.18x = 233,445.28
  5. Step 5: Solve for x
    x = 233,445.28/515.18
  6. Step 6: Final answer
    x = 453.13

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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.