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Finding the Fourth Proportional to 1,148.87, 1,585.20 and 813.77

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Solution

The fourth proportional to 1,148.87, 1,585.20 and 813.77 is: 1,122.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.87 : 1,585.20 = 813.77 : x
  2. Step 2: Convert to fraction form
    1,148.87/1,585.20 = 813.77/x
  3. Step 3: Cross multiply
    1,148.87x = 1,585.20 × 813.77
  4. Step 4: Simplify right side
    1,148.87x = 1,289,988.20
  5. Step 5: Solve for x
    x = 1,289,988.20/1,148.87
  6. Step 6: Final answer
    x = 1,122.83

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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.