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Finding the Fourth Proportional to 993.76, 1,487.76 and 921.76

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Solution

The fourth proportional to 993.76, 1,487.76 and 921.76 is: 1,379.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.76 : 1,487.76 = 921.76 : x
  2. Step 2: Convert to fraction form
    993.76/1,487.76 = 921.76/x
  3. Step 3: Cross multiply
    993.76x = 1,487.76 × 921.76
  4. Step 4: Simplify right side
    993.76x = 1,371,357.66
  5. Step 5: Solve for x
    x = 1,371,357.66/993.76
  6. Step 6: Final answer
    x = 1,379.97

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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.