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Finding the Fourth Proportional to 992.35, 1,487.97 and 407.76

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Solution

The fourth proportional to 992.35, 1,487.97 and 407.76 is: 611.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.35 : 1,487.97 = 407.76 : x
  2. Step 2: Convert to fraction form
    992.35/1,487.97 = 407.76/x
  3. Step 3: Cross multiply
    992.35x = 1,487.97 × 407.76
  4. Step 4: Simplify right side
    992.35x = 606,734.65
  5. Step 5: Solve for x
    x = 606,734.65/992.35
  6. Step 6: Final answer
    x = 611.41

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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.