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Finding the Fourth Proportional to 927.14, 1,390.72 and 439.93

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Solution

The fourth proportional to 927.14, 1,390.72 and 439.93 is: 659.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.14 : 1,390.72 = 439.93 : x
  2. Step 2: Convert to fraction form
    927.14/1,390.72 = 439.93/x
  3. Step 3: Cross multiply
    927.14x = 1,390.72 × 439.93
  4. Step 4: Simplify right side
    927.14x = 611,814.87
  5. Step 5: Solve for x
    x = 611,814.87/927.14
  6. Step 6: Final answer
    x = 659.89

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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.