Home / 212,108.68-318,175.44-78,978.16

Finding the Fourth Proportional to 212,108.68, 318,175.44 and 78,978.16

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Solution

The fourth proportional to 212,108.68, 318,175.44 and 78,978.16 is: 118,471.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,108.68 : 318,175.44 = 78,978.16 : x
  2. Step 2: Convert to fraction form
    212,108.68/318,175.44 = 78,978.16/x
  3. Step 3: Cross multiply
    212,108.68x = 318,175.44 × 78,978.16
  4. Step 4: Simplify right side
    212,108.68x = 25,128,910,808.39
  5. Step 5: Solve for x
    x = 25,128,910,808.39/212,108.68
  6. Step 6: Final answer
    x = 118,471.86

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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.