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Finding the Fourth Proportional to 978.90, 1,468.59 and 320.83

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Solution

The fourth proportional to 978.90, 1,468.59 and 320.83 is: 481.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.90 : 1,468.59 = 320.83 : x
  2. Step 2: Convert to fraction form
    978.90/1,468.59 = 320.83/x
  3. Step 3: Cross multiply
    978.90x = 1,468.59 × 320.83
  4. Step 4: Simplify right side
    978.90x = 471,163.76
  5. Step 5: Solve for x
    x = 471,163.76/978.90
  6. Step 6: Final answer
    x = 481.32

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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.