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Finding the Fourth Proportional to 1,201.81, 1,659.88 and 802.78

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Solution

The fourth proportional to 1,201.81, 1,659.88 and 802.78 is: 1,108.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.81 : 1,659.88 = 802.78 : x
  2. Step 2: Convert to fraction form
    1,201.81/1,659.88 = 802.78/x
  3. Step 3: Cross multiply
    1,201.81x = 1,659.88 × 802.78
  4. Step 4: Simplify right side
    1,201.81x = 1,332,518.47
  5. Step 5: Solve for x
    x = 1,332,518.47/1,201.81
  6. Step 6: Final answer
    x = 1,108.76

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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.