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Finding the Fourth Proportional to 212,978.80, 319,079.40 and 129,775.60

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Solution

The fourth proportional to 212,978.80, 319,079.40 and 129,775.60 is: 194,426.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,978.80 : 319,079.40 = 129,775.60 : x
  2. Step 2: Convert to fraction form
    212,978.80/319,079.40 = 129,775.60/x
  3. Step 3: Cross multiply
    212,978.80x = 319,079.40 × 129,775.60
  4. Step 4: Simplify right side
    212,978.80x = 41,408,720,582.64
  5. Step 5: Solve for x
    x = 41,408,720,582.64/212,978.80
  6. Step 6: Final answer
    x = 194,426.49

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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.