Home / 128,375.04-177,157.44-71,787.36

Finding the Fourth Proportional to 128,375.04, 177,157.44 and 71,787.36

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Solution

The fourth proportional to 128,375.04, 177,157.44 and 71,787.36 is: 99,066.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,375.04 : 177,157.44 = 71,787.36 : x
  2. Step 2: Convert to fraction form
    128,375.04/177,157.44 = 71,787.36/x
  3. Step 3: Cross multiply
    128,375.04x = 177,157.44 × 71,787.36
  4. Step 4: Simplify right side
    128,375.04x = 12,717,664,921.96
  5. Step 5: Solve for x
    x = 12,717,664,921.96/128,375.04
  6. Step 6: Final answer
    x = 99,066.49

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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.