Home / 1,289.28-1,777.98-869.70

Finding the Fourth Proportional to 1,289.28, 1,777.98 and 869.70

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Solution

The fourth proportional to 1,289.28, 1,777.98 and 869.70 is: 1,199.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.28 : 1,777.98 = 869.70 : x
  2. Step 2: Convert to fraction form
    1,289.28/1,777.98 = 869.70/x
  3. Step 3: Cross multiply
    1,289.28x = 1,777.98 × 869.70
  4. Step 4: Simplify right side
    1,289.28x = 1,546,309.21
  5. Step 5: Solve for x
    x = 1,546,309.21/1,289.28
  6. Step 6: Final answer
    x = 1,199.36

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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.