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Finding the Fourth Proportional to 1,246.69, 1,868.95 and 921.61

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Solution

The fourth proportional to 1,246.69, 1,868.95 and 921.61 is: 1,381.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.69 : 1,868.95 = 921.61 : x
  2. Step 2: Convert to fraction form
    1,246.69/1,868.95 = 921.61/x
  3. Step 3: Cross multiply
    1,246.69x = 1,868.95 × 921.61
  4. Step 4: Simplify right side
    1,246.69x = 1,722,443.01
  5. Step 5: Solve for x
    x = 1,722,443.01/1,246.69
  6. Step 6: Final answer
    x = 1,381.61

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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.