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Finding the Fourth Proportional to 1,334.50, 1,993.65 and 1,115.80

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Solution

The fourth proportional to 1,334.50, 1,993.65 and 1,115.80 is: 1,666.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,334.50 : 1,993.65 = 1,115.80 : x
  2. Step 2: Convert to fraction form
    1,334.50/1,993.65 = 1,115.80/x
  3. Step 3: Cross multiply
    1,334.50x = 1,993.65 × 1,115.80
  4. Step 4: Simplify right side
    1,334.50x = 2,224,514.67
  5. Step 5: Solve for x
    x = 2,224,514.67/1,334.50
  6. Step 6: Final answer
    x = 1,666.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.