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Finding the Fourth Proportional to 279,340.97, 385,490.85 and 156,816.32

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Solution

The fourth proportional to 279,340.97, 385,490.85 and 156,816.32 is: 216,406.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,340.97 : 385,490.85 = 156,816.32 : x
  2. Step 2: Convert to fraction form
    279,340.97/385,490.85 = 156,816.32/x
  3. Step 3: Cross multiply
    279,340.97x = 385,490.85 × 156,816.32
  4. Step 4: Simplify right side
    279,340.97x = 60,451,257,748.43
  5. Step 5: Solve for x
    x = 60,451,257,748.43/279,340.97
  6. Step 6: Final answer
    x = 216,406.70

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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.