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Finding the Fourth Proportional to 1,281.12, 1,766.88 and 904.25

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Solution

The fourth proportional to 1,281.12, 1,766.88 and 904.25 is: 1,247.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.12 : 1,766.88 = 904.25 : x
  2. Step 2: Convert to fraction form
    1,281.12/1,766.88 = 904.25/x
  3. Step 3: Cross multiply
    1,281.12x = 1,766.88 × 904.25
  4. Step 4: Simplify right side
    1,281.12x = 1,597,695.72
  5. Step 5: Solve for x
    x = 1,597,695.72/1,281.12
  6. Step 6: Final answer
    x = 1,247.11

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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.