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Finding the Fourth Proportional to 1,351.85, 1,864.74 and 854.30

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Solution

The fourth proportional to 1,351.85, 1,864.74 and 854.30 is: 1,178.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.85 : 1,864.74 = 854.30 : x
  2. Step 2: Convert to fraction form
    1,351.85/1,864.74 = 854.30/x
  3. Step 3: Cross multiply
    1,351.85x = 1,864.74 × 854.30
  4. Step 4: Simplify right side
    1,351.85x = 1,593,047.38
  5. Step 5: Solve for x
    x = 1,593,047.38/1,351.85
  6. Step 6: Final answer
    x = 1,178.42

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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.