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Finding the Fourth Proportional to 910.56, 1,249.68 and 815.16

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Solution

The fourth proportional to 910.56, 1,249.68 and 815.16 is: 1,118.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.56 : 1,249.68 = 815.16 : x
  2. Step 2: Convert to fraction form
    910.56/1,249.68 = 815.16/x
  3. Step 3: Cross multiply
    910.56x = 1,249.68 × 815.16
  4. Step 4: Simplify right side
    910.56x = 1,018,689.15
  5. Step 5: Solve for x
    x = 1,018,689.15/910.56
  6. Step 6: Final answer
    x = 1,118.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.