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Finding the Fourth Proportional to 1,259.15, 1,889.42 and 479.66

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Solution

The fourth proportional to 1,259.15, 1,889.42 and 479.66 is: 719.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.15 : 1,889.42 = 479.66 : x
  2. Step 2: Convert to fraction form
    1,259.15/1,889.42 = 479.66/x
  3. Step 3: Cross multiply
    1,259.15x = 1,889.42 × 479.66
  4. Step 4: Simplify right side
    1,259.15x = 906,267.35
  5. Step 5: Solve for x
    x = 906,267.35/1,259.15
  6. Step 6: Final answer
    x = 719.75

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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.