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Finding the Fourth Proportional to 615.37, 921.91 and 306.86

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Solution

The fourth proportional to 615.37, 921.91 and 306.86 is: 459.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.37 : 921.91 = 306.86 : x
  2. Step 2: Convert to fraction form
    615.37/921.91 = 306.86/x
  3. Step 3: Cross multiply
    615.37x = 921.91 × 306.86
  4. Step 4: Simplify right side
    615.37x = 282,899.42
  5. Step 5: Solve for x
    x = 282,899.42/615.37
  6. Step 6: Final answer
    x = 459.72

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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.