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Finding the Fourth Proportional to 929.75, 1,394.78 and 313.52

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Solution

The fourth proportional to 929.75, 1,394.78 and 313.52 is: 470.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.75 : 1,394.78 = 313.52 : x
  2. Step 2: Convert to fraction form
    929.75/1,394.78 = 313.52/x
  3. Step 3: Cross multiply
    929.75x = 1,394.78 × 313.52
  4. Step 4: Simplify right side
    929.75x = 437,282.88
  5. Step 5: Solve for x
    x = 437,282.88/929.75
  6. Step 6: Final answer
    x = 470.33

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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.