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Finding the Fourth Proportional to 1,109.86, 1,661.55 and 801.70

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Solution

The fourth proportional to 1,109.86, 1,661.55 and 801.70 is: 1,200.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.86 : 1,661.55 = 801.70 : x
  2. Step 2: Convert to fraction form
    1,109.86/1,661.55 = 801.70/x
  3. Step 3: Cross multiply
    1,109.86x = 1,661.55 × 801.70
  4. Step 4: Simplify right side
    1,109.86x = 1,332,064.64
  5. Step 5: Solve for x
    x = 1,332,064.64/1,109.86
  6. Step 6: Final answer
    x = 1,200.21

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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.