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Finding the Fourth Proportional to 810.92, 1,215.57 and 749.90

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Solution

The fourth proportional to 810.92, 1,215.57 and 749.90 is: 1,124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.92 : 1,215.57 = 749.90 : x
  2. Step 2: Convert to fraction form
    810.92/1,215.57 = 749.90/x
  3. Step 3: Cross multiply
    810.92x = 1,215.57 × 749.90
  4. Step 4: Simplify right side
    810.92x = 911,555.94
  5. Step 5: Solve for x
    x = 911,555.94/810.92
  6. Step 6: Final answer
    x = 1,124.10

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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.