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Finding the Fourth Proportional to 1,140.77, 1,709.93 and 815.15

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Solution

The fourth proportional to 1,140.77, 1,709.93 and 815.15 is: 1,221.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.77 : 1,709.93 = 815.15 : x
  2. Step 2: Convert to fraction form
    1,140.77/1,709.93 = 815.15/x
  3. Step 3: Cross multiply
    1,140.77x = 1,709.93 × 815.15
  4. Step 4: Simplify right side
    1,140.77x = 1,393,849.44
  5. Step 5: Solve for x
    x = 1,393,849.44/1,140.77
  6. Step 6: Final answer
    x = 1,221.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.