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Finding the Fourth Proportional to 801.09, 1,105.65 and 653.47

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Solution

The fourth proportional to 801.09, 1,105.65 and 653.47 is: 901.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.09 : 1,105.65 = 653.47 : x
  2. Step 2: Convert to fraction form
    801.09/1,105.65 = 653.47/x
  3. Step 3: Cross multiply
    801.09x = 1,105.65 × 653.47
  4. Step 4: Simplify right side
    801.09x = 722,506.34
  5. Step 5: Solve for x
    x = 722,506.34/801.09
  6. Step 6: Final answer
    x = 901.90

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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.