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Finding the Fourth Proportional to 128,372.40, 177,158.75 and 71,783.64

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Solution

The fourth proportional to 128,372.40, 177,158.75 and 71,783.64 is: 99,064.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,372.40 : 177,158.75 = 71,783.64 : x
  2. Step 2: Convert to fraction form
    128,372.40/177,158.75 = 71,783.64/x
  3. Step 3: Cross multiply
    128,372.40x = 177,158.75 × 71,783.64
  4. Step 4: Simplify right side
    128,372.40x = 12,717,099,573.93
  5. Step 5: Solve for x
    x = 12,717,099,573.93/128,372.40
  6. Step 6: Final answer
    x = 99,064.13

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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.