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Finding the Fourth Proportional to 978.36, 1,467.32 and 451.14

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Solution

The fourth proportional to 978.36, 1,467.32 and 451.14 is: 676.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.36 : 1,467.32 = 451.14 : x
  2. Step 2: Convert to fraction form
    978.36/1,467.32 = 451.14/x
  3. Step 3: Cross multiply
    978.36x = 1,467.32 × 451.14
  4. Step 4: Simplify right side
    978.36x = 661,964.49
  5. Step 5: Solve for x
    x = 661,964.49/978.36
  6. Step 6: Final answer
    x = 676.61

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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.