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Finding the Fourth Proportional to 1,015.32, 1,401.40 and 622.28

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Solution

The fourth proportional to 1,015.32, 1,401.40 and 622.28 is: 858.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.32 : 1,401.40 = 622.28 : x
  2. Step 2: Convert to fraction form
    1,015.32/1,401.40 = 622.28/x
  3. Step 3: Cross multiply
    1,015.32x = 1,401.40 × 622.28
  4. Step 4: Simplify right side
    1,015.32x = 872,063.19
  5. Step 5: Solve for x
    x = 872,063.19/1,015.32
  6. Step 6: Final answer
    x = 858.90

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1.5x scale

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.