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Finding the Fourth Proportional to 2,215.92, 3,321.40 and 916.68

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Solution

The fourth proportional to 2,215.92, 3,321.40 and 916.68 is: 1,373.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,215.92 : 3,321.40 = 916.68 : x
  2. Step 2: Convert to fraction form
    2,215.92/3,321.40 = 916.68/x
  3. Step 3: Cross multiply
    2,215.92x = 3,321.40 × 916.68
  4. Step 4: Simplify right side
    2,215.92x = 3,044,660.95
  5. Step 5: Solve for x
    x = 3,044,660.95/2,215.92
  6. Step 6: Final answer
    x = 1,373.99

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1.5x scale

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.