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Finding the Fourth Proportional to 1,259.40, 1,889.10 and 479.22

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Solution

The fourth proportional to 1,259.40, 1,889.10 and 479.22 is: 718.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.40 : 1,889.10 = 479.22 : x
  2. Step 2: Convert to fraction form
    1,259.40/1,889.10 = 479.22/x
  3. Step 3: Cross multiply
    1,259.40x = 1,889.10 × 479.22
  4. Step 4: Simplify right side
    1,259.40x = 905,298.04
  5. Step 5: Solve for x
    x = 905,298.04/1,259.40
  6. Step 6: Final answer
    x = 718.83

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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.