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Finding the Fourth Proportional to 651.93, 978.09 and 219.09

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Solution

The fourth proportional to 651.93, 978.09 and 219.09 is: 328.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.93 : 978.09 = 219.09 : x
  2. Step 2: Convert to fraction form
    651.93/978.09 = 219.09/x
  3. Step 3: Cross multiply
    651.93x = 978.09 × 219.09
  4. Step 4: Simplify right side
    651.93x = 214,289.74
  5. Step 5: Solve for x
    x = 214,289.74/651.93
  6. Step 6: Final answer
    x = 328.70

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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.