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Finding the Fourth Proportional to 565.36, 780.24 and 391.12

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Solution

The fourth proportional to 565.36, 780.24 and 391.12 is: 539.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.36 : 780.24 = 391.12 : x
  2. Step 2: Convert to fraction form
    565.36/780.24 = 391.12/x
  3. Step 3: Cross multiply
    565.36x = 780.24 × 391.12
  4. Step 4: Simplify right side
    565.36x = 305,167.47
  5. Step 5: Solve for x
    x = 305,167.47/565.36
  6. Step 6: Final answer
    x = 539.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.