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Finding the Fourth Proportional to 128,276.21, 177,019.97 and 70,917.03

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Solution

The fourth proportional to 128,276.21, 177,019.97 and 70,917.03 is: 97,864.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,276.21 : 177,019.97 = 70,917.03 : x
  2. Step 2: Convert to fraction form
    128,276.21/177,019.97 = 70,917.03/x
  3. Step 3: Cross multiply
    128,276.21x = 177,019.97 × 70,917.03
  4. Step 4: Simplify right side
    128,276.21x = 12,553,730,168.50
  5. Step 5: Solve for x
    x = 12,553,730,168.50/128,276.21
  6. Step 6: Final answer
    x = 97,864.84

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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.