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Finding the Fourth Proportional to 1,015.60, 1,400.82 and 622.81

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Solution

The fourth proportional to 1,015.60, 1,400.82 and 622.81 is: 859.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.60 : 1,400.82 = 622.81 : x
  2. Step 2: Convert to fraction form
    1,015.60/1,400.82 = 622.81/x
  3. Step 3: Cross multiply
    1,015.60x = 1,400.82 × 622.81
  4. Step 4: Simplify right side
    1,015.60x = 872,444.70
  5. Step 5: Solve for x
    x = 872,444.70/1,015.60
  6. Step 6: Final answer
    x = 859.04

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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.