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Finding the Fourth Proportional to 978.54, 1,468.08 and 691.80

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Solution

The fourth proportional to 978.54, 1,468.08 and 691.80 is: 1,037.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.54 : 1,468.08 = 691.80 : x
  2. Step 2: Convert to fraction form
    978.54/1,468.08 = 691.80/x
  3. Step 3: Cross multiply
    978.54x = 1,468.08 × 691.80
  4. Step 4: Simplify right side
    978.54x = 1,015,617.74
  5. Step 5: Solve for x
    x = 1,015,617.74/978.54
  6. Step 6: Final answer
    x = 1,037.89

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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.