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Finding the Fourth Proportional to 1,091.10, 1,505.18 and 648.74

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Solution

The fourth proportional to 1,091.10, 1,505.18 and 648.74 is: 894.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.10 : 1,505.18 = 648.74 : x
  2. Step 2: Convert to fraction form
    1,091.10/1,505.18 = 648.74/x
  3. Step 3: Cross multiply
    1,091.10x = 1,505.18 × 648.74
  4. Step 4: Simplify right side
    1,091.10x = 976,470.47
  5. Step 5: Solve for x
    x = 976,470.47/1,091.10
  6. Step 6: Final answer
    x = 894.94

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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.