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Finding the Fourth Proportional to 615.78, 923.87 and 291.11

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Solution

The fourth proportional to 615.78, 923.87 and 291.11 is: 436.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.78 : 923.87 = 291.11 : x
  2. Step 2: Convert to fraction form
    615.78/923.87 = 291.11/x
  3. Step 3: Cross multiply
    615.78x = 923.87 × 291.11
  4. Step 4: Simplify right side
    615.78x = 268,943.90
  5. Step 5: Solve for x
    x = 268,943.90/615.78
  6. Step 6: Final answer
    x = 436.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.