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Finding the Fourth Proportional to 876, 1,205.04 and 840.48

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Solution

The fourth proportional to 876, 1,205.04 and 840.48 is: 1,156.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    876 : 1,205.04 = 840.48 : x
  2. Step 2: Convert to fraction form
    876/1,205.04 = 840.48/x
  3. Step 3: Cross multiply
    876x = 1,205.04 × 840.48
  4. Step 4: Simplify right side
    876x = 1,012,812.02
  5. Step 5: Solve for x
    x = 1,012,812.02/876
  6. Step 6: Final answer
    x = 1,156.18

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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.