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Finding the Fourth Proportional to 1,103.42, 1,655.44 and 518.40

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Solution

The fourth proportional to 1,103.42, 1,655.44 and 518.40 is: 777.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.42 : 1,655.44 = 518.40 : x
  2. Step 2: Convert to fraction form
    1,103.42/1,655.44 = 518.40/x
  3. Step 3: Cross multiply
    1,103.42x = 1,655.44 × 518.40
  4. Step 4: Simplify right side
    1,103.42x = 858,178.80
  5. Step 5: Solve for x
    x = 858,178.80/1,103.42
  6. Step 6: Final answer
    x = 777.74

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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.