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Finding the Fourth Proportional to 1,113.55, 1,669.41 and 869.33

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Solution

The fourth proportional to 1,113.55, 1,669.41 and 869.33 is: 1,303.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.55 : 1,669.41 = 869.33 : x
  2. Step 2: Convert to fraction form
    1,113.55/1,669.41 = 869.33/x
  3. Step 3: Cross multiply
    1,113.55x = 1,669.41 × 869.33
  4. Step 4: Simplify right side
    1,113.55x = 1,451,272.37
  5. Step 5: Solve for x
    x = 1,451,272.37/1,113.55
  6. Step 6: Final answer
    x = 1,303.29

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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.