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Finding the Fourth Proportional to 586.38, 879.78 and 261.72

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Solution

The fourth proportional to 586.38, 879.78 and 261.72 is: 392.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.38 : 879.78 = 261.72 : x
  2. Step 2: Convert to fraction form
    586.38/879.78 = 261.72/x
  3. Step 3: Cross multiply
    586.38x = 879.78 × 261.72
  4. Step 4: Simplify right side
    586.38x = 230,256.02
  5. Step 5: Solve for x
    x = 230,256.02/586.38
  6. Step 6: Final answer
    x = 392.67

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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.