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Finding the Fourth Proportional to 1,115.34, 1,669.92 and 840.59

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Solution

The fourth proportional to 1,115.34, 1,669.92 and 840.59 is: 1,258.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.34 : 1,669.92 = 840.59 : x
  2. Step 2: Convert to fraction form
    1,115.34/1,669.92 = 840.59/x
  3. Step 3: Cross multiply
    1,115.34x = 1,669.92 × 840.59
  4. Step 4: Simplify right side
    1,115.34x = 1,403,722.21
  5. Step 5: Solve for x
    x = 1,403,722.21/1,115.34
  6. Step 6: Final answer
    x = 1,258.56

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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.