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Finding the Fourth Proportional to 279,311.64, 385,443.78 and 151,987.56

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Solution

The fourth proportional to 279,311.64, 385,443.78 and 151,987.56 is: 209,739.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,311.64 : 385,443.78 = 151,987.56 : x
  2. Step 2: Convert to fraction form
    279,311.64/385,443.78 = 151,987.56/x
  3. Step 3: Cross multiply
    279,311.64x = 385,443.78 × 151,987.56
  4. Step 4: Simplify right side
    279,311.64x = 58,582,659,639.38
  5. Step 5: Solve for x
    x = 58,582,659,639.38/279,311.64
  6. Step 6: Final answer
    x = 209,739.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.