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Finding the Fourth Proportional to 615.18, 921.42 and 289.56

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Solution

The fourth proportional to 615.18, 921.42 and 289.56 is: 433.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.18 : 921.42 = 289.56 : x
  2. Step 2: Convert to fraction form
    615.18/921.42 = 289.56/x
  3. Step 3: Cross multiply
    615.18x = 921.42 × 289.56
  4. Step 4: Simplify right side
    615.18x = 266,806.38
  5. Step 5: Solve for x
    x = 266,806.38/615.18
  6. Step 6: Final answer
    x = 433.70

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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.