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Finding the Fourth Proportional to 615.80, 849.48 and 499.16

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Solution

The fourth proportional to 615.80, 849.48 and 499.16 is: 688.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.80 : 849.48 = 499.16 : x
  2. Step 2: Convert to fraction form
    615.80/849.48 = 499.16/x
  3. Step 3: Cross multiply
    615.80x = 849.48 × 499.16
  4. Step 4: Simplify right side
    615.80x = 424,026.44
  5. Step 5: Solve for x
    x = 424,026.44/615.80
  6. Step 6: Final answer
    x = 688.58

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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.