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Finding the Fourth Proportional to 1,127.20, 1,689.84 and 785.44

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Solution

The fourth proportional to 1,127.20, 1,689.84 and 785.44 is: 1,177.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.20 : 1,689.84 = 785.44 : x
  2. Step 2: Convert to fraction form
    1,127.20/1,689.84 = 785.44/x
  3. Step 3: Cross multiply
    1,127.20x = 1,689.84 × 785.44
  4. Step 4: Simplify right side
    1,127.20x = 1,327,267.93
  5. Step 5: Solve for x
    x = 1,327,267.93/1,127.20
  6. Step 6: Final answer
    x = 1,177.49

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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.