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Finding the Fourth Proportional to 1,338.64, 2,011.80 and 655.12

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Solution

The fourth proportional to 1,338.64, 2,011.80 and 655.12 is: 984.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.64 : 2,011.80 = 655.12 : x
  2. Step 2: Convert to fraction form
    1,338.64/2,011.80 = 655.12/x
  3. Step 3: Cross multiply
    1,338.64x = 2,011.80 × 655.12
  4. Step 4: Simplify right side
    1,338.64x = 1,317,970.42
  5. Step 5: Solve for x
    x = 1,317,970.42/1,338.64
  6. Step 6: Final answer
    x = 984.56

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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.