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Finding the Fourth Proportional to 615.18, 849.15 and 353.28

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Solution

The fourth proportional to 615.18, 849.15 and 353.28 is: 487.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.18 : 849.15 = 353.28 : x
  2. Step 2: Convert to fraction form
    615.18/849.15 = 353.28/x
  3. Step 3: Cross multiply
    615.18x = 849.15 × 353.28
  4. Step 4: Simplify right side
    615.18x = 299,987.71
  5. Step 5: Solve for x
    x = 299,987.71/615.18
  6. Step 6: Final answer
    x = 487.64

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Double scale
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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.