Home / 1,250.12-1,875.44-428.20

Finding the Fourth Proportional to 1,250.12, 1,875.44 and 428.20

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Solution

The fourth proportional to 1,250.12, 1,875.44 and 428.20 is: 642.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.12 : 1,875.44 = 428.20 : x
  2. Step 2: Convert to fraction form
    1,250.12/1,875.44 = 428.20/x
  3. Step 3: Cross multiply
    1,250.12x = 1,875.44 × 428.20
  4. Step 4: Simplify right side
    1,250.12x = 803,063.41
  5. Step 5: Solve for x
    x = 803,063.41/1,250.12
  6. Step 6: Final answer
    x = 642.39

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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.