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Finding the Fourth Proportional to 1,265.72, 1,898.40 and 399.92

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Solution

The fourth proportional to 1,265.72, 1,898.40 and 399.92 is: 599.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.72 : 1,898.40 = 399.92 : x
  2. Step 2: Convert to fraction form
    1,265.72/1,898.40 = 399.92/x
  3. Step 3: Cross multiply
    1,265.72x = 1,898.40 × 399.92
  4. Step 4: Simplify right side
    1,265.72x = 759,208.13
  5. Step 5: Solve for x
    x = 759,208.13/1,265.72
  6. Step 6: Final answer
    x = 599.82

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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.