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Finding the Fourth Proportional to 929.56, 1,394.17 and 313.21

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Solution

The fourth proportional to 929.56, 1,394.17 and 313.21 is: 469.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.56 : 1,394.17 = 313.21 : x
  2. Step 2: Convert to fraction form
    929.56/1,394.17 = 313.21/x
  3. Step 3: Cross multiply
    929.56x = 1,394.17 × 313.21
  4. Step 4: Simplify right side
    929.56x = 436,667.99
  5. Step 5: Solve for x
    x = 436,667.99/929.56
  6. Step 6: Final answer
    x = 469.76

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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.