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Finding the Fourth Proportional to 1,272.56, 1,904.88 and 862.16

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Solution

The fourth proportional to 1,272.56, 1,904.88 and 862.16 is: 1,290.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.56 : 1,904.88 = 862.16 : x
  2. Step 2: Convert to fraction form
    1,272.56/1,904.88 = 862.16/x
  3. Step 3: Cross multiply
    1,272.56x = 1,904.88 × 862.16
  4. Step 4: Simplify right side
    1,272.56x = 1,642,311.34
  5. Step 5: Solve for x
    x = 1,642,311.34/1,272.56
  6. Step 6: Final answer
    x = 1,290.56

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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.