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Finding the Fourth Proportional to 256,872.40, 385,168.56 and 79,346.32

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Solution

The fourth proportional to 256,872.40, 385,168.56 and 79,346.32 is: 118,976.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,872.40 : 385,168.56 = 79,346.32 : x
  2. Step 2: Convert to fraction form
    256,872.40/385,168.56 = 79,346.32/x
  3. Step 3: Cross multiply
    256,872.40x = 385,168.56 × 79,346.32
  4. Step 4: Simplify right side
    256,872.40x = 30,561,707,815.70
  5. Step 5: Solve for x
    x = 30,561,707,815.70/256,872.40
  6. Step 6: Final answer
    x = 118,976.22

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1.5x scale

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.