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Finding the Fourth Proportional to 615.65, 849.78 and 353.84

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Solution

The fourth proportional to 615.65, 849.78 and 353.84 is: 488.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.65 : 849.78 = 353.84 : x
  2. Step 2: Convert to fraction form
    615.65/849.78 = 353.84/x
  3. Step 3: Cross multiply
    615.65x = 849.78 × 353.84
  4. Step 4: Simplify right side
    615.65x = 300,681.91
  5. Step 5: Solve for x
    x = 300,681.91/615.65
  6. Step 6: Final answer
    x = 488.40

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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.