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Finding the Fourth Proportional to 929.42, 1,394.21 and 313.13

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Solution

The fourth proportional to 929.42, 1,394.21 and 313.13 is: 469.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.42 : 1,394.21 = 313.13 : x
  2. Step 2: Convert to fraction form
    929.42/1,394.21 = 313.13/x
  3. Step 3: Cross multiply
    929.42x = 1,394.21 × 313.13
  4. Step 4: Simplify right side
    929.42x = 436,568.98
  5. Step 5: Solve for x
    x = 436,568.98/929.42
  6. Step 6: Final answer
    x = 469.72

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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.