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Finding the Fourth Proportional to 571.58, 788.78 and 309.60

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Solution

The fourth proportional to 571.58, 788.78 and 309.60 is: 427.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.58 : 788.78 = 309.60 : x
  2. Step 2: Convert to fraction form
    571.58/788.78 = 309.60/x
  3. Step 3: Cross multiply
    571.58x = 788.78 × 309.60
  4. Step 4: Simplify right side
    571.58x = 244,206.29
  5. Step 5: Solve for x
    x = 244,206.29/571.58
  6. Step 6: Final answer
    x = 427.25

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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.