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Finding the Fourth Proportional to 1,121, 1,545.78 and 771.56

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Solution

The fourth proportional to 1,121, 1,545.78 and 771.56 is: 1,063.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121 : 1,545.78 = 771.56 : x
  2. Step 2: Convert to fraction form
    1,121/1,545.78 = 771.56/x
  3. Step 3: Cross multiply
    1,121x = 1,545.78 × 771.56
  4. Step 4: Simplify right side
    1,121x = 1,192,662.02
  5. Step 5: Solve for x
    x = 1,192,662.02/1,121
  6. Step 6: Final answer
    x = 1,063.93

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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.