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Finding the Fourth Proportional to 1,267.38, 1,900.19 and 486.74

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Solution

The fourth proportional to 1,267.38, 1,900.19 and 486.74 is: 729.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.38 : 1,900.19 = 486.74 : x
  2. Step 2: Convert to fraction form
    1,267.38/1,900.19 = 486.74/x
  3. Step 3: Cross multiply
    1,267.38x = 1,900.19 × 486.74
  4. Step 4: Simplify right side
    1,267.38x = 924,904.45
  5. Step 5: Solve for x
    x = 924,904.45/1,267.38
  6. Step 6: Final answer
    x = 729.78

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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.