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Finding the Fourth Proportional to 571.31, 788.40 and 309.32

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Solution

The fourth proportional to 571.31, 788.40 and 309.32 is: 426.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.31 : 788.40 = 309.32 : x
  2. Step 2: Convert to fraction form
    571.31/788.40 = 309.32/x
  3. Step 3: Cross multiply
    571.31x = 788.40 × 309.32
  4. Step 4: Simplify right side
    571.31x = 243,866.34
  5. Step 5: Solve for x
    x = 243,866.34/571.31
  6. Step 6: Final answer
    x = 426.86

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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.