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Finding the Fourth Proportional to 1,250, 1,874.85 and 428.26

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Solution

The fourth proportional to 1,250, 1,874.85 and 428.26 is: 642.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250 : 1,874.85 = 428.26 : x
  2. Step 2: Convert to fraction form
    1,250/1,874.85 = 428.26/x
  3. Step 3: Cross multiply
    1,250x = 1,874.85 × 428.26
  4. Step 4: Simplify right side
    1,250x = 802,923.26
  5. Step 5: Solve for x
    x = 802,923.26/1,250
  6. Step 6: Final answer
    x = 642.34

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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.