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Finding the Fourth Proportional to 1,259.60, 1,889.40 and 393.80

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Solution

The fourth proportional to 1,259.60, 1,889.40 and 393.80 is: 590.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.60 : 1,889.40 = 393.80 : x
  2. Step 2: Convert to fraction form
    1,259.60/1,889.40 = 393.80/x
  3. Step 3: Cross multiply
    1,259.60x = 1,889.40 × 393.80
  4. Step 4: Simplify right side
    1,259.60x = 744,045.72
  5. Step 5: Solve for x
    x = 744,045.72/1,259.60
  6. Step 6: Final answer
    x = 590.70

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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.