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Finding the Fourth Proportional to 212,803.74, 318,642.45 and 128,451.15

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Solution

The fourth proportional to 212,803.74, 318,642.45 and 128,451.15 is: 192,336.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,803.74 : 318,642.45 = 128,451.15 : x
  2. Step 2: Convert to fraction form
    212,803.74/318,642.45 = 128,451.15/x
  3. Step 3: Cross multiply
    212,803.74x = 318,642.45 × 128,451.15
  4. Step 4: Simplify right side
    212,803.74x = 40,929,986,905.85
  5. Step 5: Solve for x
    x = 40,929,986,905.85/212,803.74
  6. Step 6: Final answer
    x = 192,336.79

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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.