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Finding the Fourth Proportional to 1,043.19, 1,564.38 and 426.56

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Solution

The fourth proportional to 1,043.19, 1,564.38 and 426.56 is: 639.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.19 : 1,564.38 = 426.56 : x
  2. Step 2: Convert to fraction form
    1,043.19/1,564.38 = 426.56/x
  3. Step 3: Cross multiply
    1,043.19x = 1,564.38 × 426.56
  4. Step 4: Simplify right side
    1,043.19x = 667,294.11
  5. Step 5: Solve for x
    x = 667,294.11/1,043.19
  6. Step 6: Final answer
    x = 639.67

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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.