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Finding the Fourth Proportional to 1,280.27, 1,919.12 and 869.60

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Solution

The fourth proportional to 1,280.27, 1,919.12 and 869.60 is: 1,303.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.27 : 1,919.12 = 869.60 : x
  2. Step 2: Convert to fraction form
    1,280.27/1,919.12 = 869.60/x
  3. Step 3: Cross multiply
    1,280.27x = 1,919.12 × 869.60
  4. Step 4: Simplify right side
    1,280.27x = 1,668,867.20
  5. Step 5: Solve for x
    x = 1,668,867.20/1,280.27
  6. Step 6: Final answer
    x = 1,303.52

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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.