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Finding the Fourth Proportional to 615.90, 849.61 and 379.90

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Solution

The fourth proportional to 615.90, 849.61 and 379.90 is: 524.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.90 : 849.61 = 379.90 : x
  2. Step 2: Convert to fraction form
    615.90/849.61 = 379.90/x
  3. Step 3: Cross multiply
    615.90x = 849.61 × 379.90
  4. Step 4: Simplify right side
    615.90x = 322,763.77
  5. Step 5: Solve for x
    x = 322,763.77/615.90
  6. Step 6: Final answer
    x = 524.05

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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.