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Finding the Fourth Proportional to 978.93, 1,469.21 and 492.12

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Solution

The fourth proportional to 978.93, 1,469.21 and 492.12 is: 738.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.93 : 1,469.21 = 492.12 : x
  2. Step 2: Convert to fraction form
    978.93/1,469.21 = 492.12/x
  3. Step 3: Cross multiply
    978.93x = 1,469.21 × 492.12
  4. Step 4: Simplify right side
    978.93x = 723,025.16
  5. Step 5: Solve for x
    x = 723,025.16/978.93
  6. Step 6: Final answer
    x = 738.59

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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.