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Finding the Fourth Proportional to 571.11, 788.14 and 309.13

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Solution

The fourth proportional to 571.11, 788.14 and 309.13 is: 426.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.11 : 788.14 = 309.13 : x
  2. Step 2: Convert to fraction form
    571.11/788.14 = 309.13/x
  3. Step 3: Cross multiply
    571.11x = 788.14 × 309.13
  4. Step 4: Simplify right side
    571.11x = 243,635.72
  5. Step 5: Solve for x
    x = 243,635.72/571.11
  6. Step 6: Final answer
    x = 426.60

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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.