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Finding the Fourth Proportional to 1,429.36, 1,972.48 and 839.76

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Solution

The fourth proportional to 1,429.36, 1,972.48 and 839.76 is: 1,158.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.36 : 1,972.48 = 839.76 : x
  2. Step 2: Convert to fraction form
    1,429.36/1,972.48 = 839.76/x
  3. Step 3: Cross multiply
    1,429.36x = 1,972.48 × 839.76
  4. Step 4: Simplify right side
    1,429.36x = 1,656,409.80
  5. Step 5: Solve for x
    x = 1,656,409.80/1,429.36
  6. Step 6: Final answer
    x = 1,158.85

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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.