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Finding the Fourth Proportional to 212,558.28, 318,726.70 and 79,328.97

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Solution

The fourth proportional to 212,558.28, 318,726.70 and 79,328.97 is: 118,952.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,558.28 : 318,726.70 = 79,328.97 : x
  2. Step 2: Convert to fraction form
    212,558.28/318,726.70 = 79,328.97/x
  3. Step 3: Cross multiply
    212,558.28x = 318,726.70 × 79,328.97
  4. Step 4: Simplify right side
    212,558.28x = 25,284,260,624.18
  5. Step 5: Solve for x
    x = 25,284,260,624.18/212,558.28
  6. Step 6: Final answer
    x = 118,952.13

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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.