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Finding the Fourth Proportional to 651.92, 978.04 and 189.69

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Solution

The fourth proportional to 651.92, 978.04 and 189.69 is: 284.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.92 : 978.04 = 189.69 : x
  2. Step 2: Convert to fraction form
    651.92/978.04 = 189.69/x
  3. Step 3: Cross multiply
    651.92x = 978.04 × 189.69
  4. Step 4: Simplify right side
    651.92x = 185,525.68
  5. Step 5: Solve for x
    x = 185,525.68/651.92
  6. Step 6: Final answer
    x = 284.58

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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.