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Finding the Fourth Proportional to 1,039.16, 1,559.66 and 422.87

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Solution

The fourth proportional to 1,039.16, 1,559.66 and 422.87 is: 634.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.16 : 1,559.66 = 422.87 : x
  2. Step 2: Convert to fraction form
    1,039.16/1,559.66 = 422.87/x
  3. Step 3: Cross multiply
    1,039.16x = 1,559.66 × 422.87
  4. Step 4: Simplify right side
    1,039.16x = 659,523.51
  5. Step 5: Solve for x
    x = 659,523.51/1,039.16
  6. Step 6: Final answer
    x = 634.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.