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Finding the Fourth Proportional to 916.92, 1,366.56 and 890.28

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Solution

The fourth proportional to 916.92, 1,366.56 and 890.28 is: 1,326.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.92 : 1,366.56 = 890.28 : x
  2. Step 2: Convert to fraction form
    916.92/1,366.56 = 890.28/x
  3. Step 3: Cross multiply
    916.92x = 1,366.56 × 890.28
  4. Step 4: Simplify right side
    916.92x = 1,216,621.04
  5. Step 5: Solve for x
    x = 1,216,621.04/916.92
  6. Step 6: Final answer
    x = 1,326.86

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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.