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Finding the Fourth Proportional to 212,348, 318,649.19 and 79,321.75

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Solution

The fourth proportional to 212,348, 318,649.19 and 79,321.75 is: 119,030.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,348 : 318,649.19 = 79,321.75 : x
  2. Step 2: Convert to fraction form
    212,348/318,649.19 = 79,321.75/x
  3. Step 3: Cross multiply
    212,348x = 318,649.19 × 79,321.75
  4. Step 4: Simplify right side
    212,348x = 25,275,811,386.88
  5. Step 5: Solve for x
    x = 25,275,811,386.88/212,348
  6. Step 6: Final answer
    x = 119,030.14

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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.