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Finding the Fourth Proportional to 128,412.74, 177,209.88 and 71,056.24

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Solution

The fourth proportional to 128,412.74, 177,209.88 and 71,056.24 is: 98,057.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,412.74 : 177,209.88 = 71,056.24 : x
  2. Step 2: Convert to fraction form
    128,412.74/177,209.88 = 71,056.24/x
  3. Step 3: Cross multiply
    128,412.74x = 177,209.88 × 71,056.24
  4. Step 4: Simplify right side
    128,412.74x = 12,591,867,054.17
  5. Step 5: Solve for x
    x = 12,591,867,054.17/128,412.74
  6. Step 6: Final answer
    x = 98,057.77

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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.