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Finding the Fourth Proportional to 1,120.12, 1,545.81 and 622.78

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Solution

The fourth proportional to 1,120.12, 1,545.81 and 622.78 is: 859.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.12 : 1,545.81 = 622.78 : x
  2. Step 2: Convert to fraction form
    1,120.12/1,545.81 = 622.78/x
  3. Step 3: Cross multiply
    1,120.12x = 1,545.81 × 622.78
  4. Step 4: Simplify right side
    1,120.12x = 962,699.15
  5. Step 5: Solve for x
    x = 962,699.15/1,120.12
  6. Step 6: Final answer
    x = 859.46

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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.