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Finding the Fourth Proportional to 652.90, 979.40 and 213.98

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Solution

The fourth proportional to 652.90, 979.40 and 213.98 is: 320.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.90 : 979.40 = 213.98 : x
  2. Step 2: Convert to fraction form
    652.90/979.40 = 213.98/x
  3. Step 3: Cross multiply
    652.90x = 979.40 × 213.98
  4. Step 4: Simplify right side
    652.90x = 209,572.01
  5. Step 5: Solve for x
    x = 209,572.01/652.90
  6. Step 6: Final answer
    x = 320.99

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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.