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Finding the Fourth Proportional to 1,043.43, 1,565.39 and 427.05

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Solution

The fourth proportional to 1,043.43, 1,565.39 and 427.05 is: 640.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.43 : 1,565.39 = 427.05 : x
  2. Step 2: Convert to fraction form
    1,043.43/1,565.39 = 427.05/x
  3. Step 3: Cross multiply
    1,043.43x = 1,565.39 × 427.05
  4. Step 4: Simplify right side
    1,043.43x = 668,497.66
  5. Step 5: Solve for x
    x = 668,497.66/1,043.43
  6. Step 6: Final answer
    x = 640.67

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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.