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Finding the Fourth Proportional to 987.96, 1,470.72 and 940.80

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Solution

The fourth proportional to 987.96, 1,470.72 and 940.80 is: 1,400.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.96 : 1,470.72 = 940.80 : x
  2. Step 2: Convert to fraction form
    987.96/1,470.72 = 940.80/x
  3. Step 3: Cross multiply
    987.96x = 1,470.72 × 940.80
  4. Step 4: Simplify right side
    987.96x = 1,383,653.38
  5. Step 5: Solve for x
    x = 1,383,653.38/987.96
  6. Step 6: Final answer
    x = 1,400.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.