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Finding the Fourth Proportional to 978.79, 1,468.15 and 458.60

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Solution

The fourth proportional to 978.79, 1,468.15 and 458.60 is: 687.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.79 : 1,468.15 = 458.60 : x
  2. Step 2: Convert to fraction form
    978.79/1,468.15 = 458.60/x
  3. Step 3: Cross multiply
    978.79x = 1,468.15 × 458.60
  4. Step 4: Simplify right side
    978.79x = 673,293.59
  5. Step 5: Solve for x
    x = 673,293.59/978.79
  6. Step 6: Final answer
    x = 687.88

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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.