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Finding the Fourth Proportional to 967.68, 1,451.40 and 318.40

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Solution

The fourth proportional to 967.68, 1,451.40 and 318.40 is: 477.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.68 : 1,451.40 = 318.40 : x
  2. Step 2: Convert to fraction form
    967.68/1,451.40 = 318.40/x
  3. Step 3: Cross multiply
    967.68x = 1,451.40 × 318.40
  4. Step 4: Simplify right side
    967.68x = 462,125.76
  5. Step 5: Solve for x
    x = 462,125.76/967.68
  6. Step 6: Final answer
    x = 477.56

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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.