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Finding the Fourth Proportional to 1,120.15, 1,545.78 and 622.77

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Solution

The fourth proportional to 1,120.15, 1,545.78 and 622.77 is: 859.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.15 : 1,545.78 = 622.77 : x
  2. Step 2: Convert to fraction form
    1,120.15/1,545.78 = 622.77/x
  3. Step 3: Cross multiply
    1,120.15x = 1,545.78 × 622.77
  4. Step 4: Simplify right side
    1,120.15x = 962,665.41
  5. Step 5: Solve for x
    x = 962,665.41/1,120.15
  6. Step 6: Final answer
    x = 859.41

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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.