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Finding the Fourth Proportional to 1,044.21, 1,564.94 and 427.21

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Solution

The fourth proportional to 1,044.21, 1,564.94 and 427.21 is: 640.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,044.21 : 1,564.94 = 427.21 : x
  2. Step 2: Convert to fraction form
    1,044.21/1,564.94 = 427.21/x
  3. Step 3: Cross multiply
    1,044.21x = 1,564.94 × 427.21
  4. Step 4: Simplify right side
    1,044.21x = 668,552.77
  5. Step 5: Solve for x
    x = 668,552.77/1,044.21
  6. Step 6: Final answer
    x = 640.25

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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.