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Finding the Fourth Proportional to 1,015, 1,400.70 and 622.18

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Solution

The fourth proportional to 1,015, 1,400.70 and 622.18 is: 858.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015 : 1,400.70 = 622.18 : x
  2. Step 2: Convert to fraction form
    1,015/1,400.70 = 622.18/x
  3. Step 3: Cross multiply
    1,015x = 1,400.70 × 622.18
  4. Step 4: Simplify right side
    1,015x = 871,487.53
  5. Step 5: Solve for x
    x = 871,487.53/1,015
  6. Step 6: Final answer
    x = 858.61

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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.