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Finding the Fourth Proportional to 978.82, 1,468.24 and 423.40

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Solution

The fourth proportional to 978.82, 1,468.24 and 423.40 is: 635.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.82 : 1,468.24 = 423.40 : x
  2. Step 2: Convert to fraction form
    978.82/1,468.24 = 423.40/x
  3. Step 3: Cross multiply
    978.82x = 1,468.24 × 423.40
  4. Step 4: Simplify right side
    978.82x = 621,652.82
  5. Step 5: Solve for x
    x = 621,652.82/978.82
  6. Step 6: Final answer
    x = 635.10

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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.