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Finding the Fourth Proportional to 1,388.80, 1,926.08 and 1,324.80

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Solution

The fourth proportional to 1,388.80, 1,926.08 and 1,324.80 is: 1,837.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.80 : 1,926.08 = 1,324.80 : x
  2. Step 2: Convert to fraction form
    1,388.80/1,926.08 = 1,324.80/x
  3. Step 3: Cross multiply
    1,388.80x = 1,926.08 × 1,324.80
  4. Step 4: Simplify right side
    1,388.80x = 2,551,670.78
  5. Step 5: Solve for x
    x = 2,551,670.78/1,388.80
  6. Step 6: Final answer
    x = 1,837.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.