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Finding the Fourth Proportional to 1,250.08, 1,875 and 428.34

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Solution

The fourth proportional to 1,250.08, 1,875 and 428.34 is: 642.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.08 : 1,875 = 428.34 : x
  2. Step 2: Convert to fraction form
    1,250.08/1,875 = 428.34/x
  3. Step 3: Cross multiply
    1,250.08x = 1,875 × 428.34
  4. Step 4: Simplify right side
    1,250.08x = 803,137.50
  5. Step 5: Solve for x
    x = 803,137.50/1,250.08
  6. Step 6: Final answer
    x = 642.47

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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.