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Finding the Fourth Proportional to 1,259.68, 1,889.72 and 393.88

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Solution

The fourth proportional to 1,259.68, 1,889.72 and 393.88 is: 590.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.68 : 1,889.72 = 393.88 : x
  2. Step 2: Convert to fraction form
    1,259.68/1,889.72 = 393.88/x
  3. Step 3: Cross multiply
    1,259.68x = 1,889.72 × 393.88
  4. Step 4: Simplify right side
    1,259.68x = 744,322.91
  5. Step 5: Solve for x
    x = 744,322.91/1,259.68
  6. Step 6: Final answer
    x = 590.88

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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.