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Finding the Fourth Proportional to 978.15, 1,467.50 and 401.43

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Solution

The fourth proportional to 978.15, 1,467.50 and 401.43 is: 602.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.15 : 1,467.50 = 401.43 : x
  2. Step 2: Convert to fraction form
    978.15/1,467.50 = 401.43/x
  3. Step 3: Cross multiply
    978.15x = 1,467.50 × 401.43
  4. Step 4: Simplify right side
    978.15x = 589,098.53
  5. Step 5: Solve for x
    x = 589,098.53/978.15
  6. Step 6: Final answer
    x = 602.26

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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.