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Finding the Fourth Proportional to 912.91, 1,260.40 and 814.49

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Solution

The fourth proportional to 912.91, 1,260.40 and 814.49 is: 1,124.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.91 : 1,260.40 = 814.49 : x
  2. Step 2: Convert to fraction form
    912.91/1,260.40 = 814.49/x
  3. Step 3: Cross multiply
    912.91x = 1,260.40 × 814.49
  4. Step 4: Simplify right side
    912.91x = 1,026,581.16
  5. Step 5: Solve for x
    x = 1,026,581.16/912.91
  6. Step 6: Final answer
    x = 1,124.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.