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Finding the Fourth Proportional to 1,265.66, 1,898.79 and 399.97

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Solution

The fourth proportional to 1,265.66, 1,898.79 and 399.97 is: 600.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.66 : 1,898.79 = 399.97 : x
  2. Step 2: Convert to fraction form
    1,265.66/1,898.79 = 399.97/x
  3. Step 3: Cross multiply
    1,265.66x = 1,898.79 × 399.97
  4. Step 4: Simplify right side
    1,265.66x = 759,459.04
  5. Step 5: Solve for x
    x = 759,459.04/1,265.66
  6. Step 6: Final answer
    x = 600.05

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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.