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Finding the Fourth Proportional to 1,304.55, 1,801.17 and 911.70

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Solution

The fourth proportional to 1,304.55, 1,801.17 and 911.70 is: 1,258.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.55 : 1,801.17 = 911.70 : x
  2. Step 2: Convert to fraction form
    1,304.55/1,801.17 = 911.70/x
  3. Step 3: Cross multiply
    1,304.55x = 1,801.17 × 911.70
  4. Step 4: Simplify right side
    1,304.55x = 1,642,126.69
  5. Step 5: Solve for x
    x = 1,642,126.69/1,304.55
  6. Step 6: Final answer
    x = 1,258.77

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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.