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Finding the Fourth Proportional to 540.40, 810.78 and 193.72

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Solution

The fourth proportional to 540.40, 810.78 and 193.72 is: 290.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.40 : 810.78 = 193.72 : x
  2. Step 2: Convert to fraction form
    540.40/810.78 = 193.72/x
  3. Step 3: Cross multiply
    540.40x = 810.78 × 193.72
  4. Step 4: Simplify right side
    540.40x = 157,064.30
  5. Step 5: Solve for x
    x = 157,064.30/540.40
  6. Step 6: Final answer
    x = 290.64

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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.