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Finding the Fourth Proportional to 1,254.60, 1,879.20 and 1,117.80

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Solution

The fourth proportional to 1,254.60, 1,879.20 and 1,117.80 is: 1,674.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.60 : 1,879.20 = 1,117.80 : x
  2. Step 2: Convert to fraction form
    1,254.60/1,879.20 = 1,117.80/x
  3. Step 3: Cross multiply
    1,254.60x = 1,879.20 × 1,117.80
  4. Step 4: Simplify right side
    1,254.60x = 2,100,569.76
  5. Step 5: Solve for x
    x = 2,100,569.76/1,254.60
  6. Step 6: Final answer
    x = 1,674.29

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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.