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Finding the Fourth Proportional to 931.07, 1,396.65 and 315.18

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Solution

The fourth proportional to 931.07, 1,396.65 and 315.18 is: 472.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.07 : 1,396.65 = 315.18 : x
  2. Step 2: Convert to fraction form
    931.07/1,396.65 = 315.18/x
  3. Step 3: Cross multiply
    931.07x = 1,396.65 × 315.18
  4. Step 4: Simplify right side
    931.07x = 440,189.16
  5. Step 5: Solve for x
    x = 440,189.16/931.07
  6. Step 6: Final answer
    x = 472.78

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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.