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Finding the Fourth Proportional to 978.10, 1,467.51 and 400.84

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Solution

The fourth proportional to 978.10, 1,467.51 and 400.84 is: 601.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.10 : 1,467.51 = 400.84 : x
  2. Step 2: Convert to fraction form
    978.10/1,467.51 = 400.84/x
  3. Step 3: Cross multiply
    978.10x = 1,467.51 × 400.84
  4. Step 4: Simplify right side
    978.10x = 588,236.71
  5. Step 5: Solve for x
    x = 588,236.71/978.10
  6. Step 6: Final answer
    x = 601.41

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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.