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Finding the Fourth Proportional to 1,289.71, 1,933.22 and 980.92

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Solution

The fourth proportional to 1,289.71, 1,933.22 and 980.92 is: 1,470.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.71 : 1,933.22 = 980.92 : x
  2. Step 2: Convert to fraction form
    1,289.71/1,933.22 = 980.92/x
  3. Step 3: Cross multiply
    1,289.71x = 1,933.22 × 980.92
  4. Step 4: Simplify right side
    1,289.71x = 1,896,331.78
  5. Step 5: Solve for x
    x = 1,896,331.78/1,289.71
  6. Step 6: Final answer
    x = 1,470.36

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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.