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Finding the Fourth Proportional to 1,138.96, 1,707 and 772.84

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Solution

The fourth proportional to 1,138.96, 1,707 and 772.84 is: 1,158.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.96 : 1,707 = 772.84 : x
  2. Step 2: Convert to fraction form
    1,138.96/1,707 = 772.84/x
  3. Step 3: Cross multiply
    1,138.96x = 1,707 × 772.84
  4. Step 4: Simplify right side
    1,138.96x = 1,319,237.88
  5. Step 5: Solve for x
    x = 1,319,237.88/1,138.96
  6. Step 6: Final answer
    x = 1,158.28

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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.