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Finding the Fourth Proportional to 1,359.05, 1,876.65 and 862.57

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Solution

The fourth proportional to 1,359.05, 1,876.65 and 862.57 is: 1,191.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.05 : 1,876.65 = 862.57 : x
  2. Step 2: Convert to fraction form
    1,359.05/1,876.65 = 862.57/x
  3. Step 3: Cross multiply
    1,359.05x = 1,876.65 × 862.57
  4. Step 4: Simplify right side
    1,359.05x = 1,618,741.99
  5. Step 5: Solve for x
    x = 1,618,741.99/1,359.05
  6. Step 6: Final answer
    x = 1,191.08

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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.