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Finding the Fourth Proportional to 615.29, 848.96 and 391.29

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Solution

The fourth proportional to 615.29, 848.96 and 391.29 is: 539.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.29 : 848.96 = 391.29 : x
  2. Step 2: Convert to fraction form
    615.29/848.96 = 391.29/x
  3. Step 3: Cross multiply
    615.29x = 848.96 × 391.29
  4. Step 4: Simplify right side
    615.29x = 332,189.56
  5. Step 5: Solve for x
    x = 332,189.56/615.29
  6. Step 6: Final answer
    x = 539.89

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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.