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Finding the Fourth Proportional to 927.99, 1,390.37 and 666.72

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Solution

The fourth proportional to 927.99, 1,390.37 and 666.72 is: 998.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.99 : 1,390.37 = 666.72 : x
  2. Step 2: Convert to fraction form
    927.99/1,390.37 = 666.72/x
  3. Step 3: Cross multiply
    927.99x = 1,390.37 × 666.72
  4. Step 4: Simplify right side
    927.99x = 926,984.15
  5. Step 5: Solve for x
    x = 926,984.15/927.99
  6. Step 6: Final answer
    x = 998.92

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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.