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Finding the Fourth Proportional to 128,341.64, 176,926.20 and 87,991.50

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Solution

The fourth proportional to 128,341.64, 176,926.20 and 87,991.50 is: 121,301.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,341.64 : 176,926.20 = 87,991.50 : x
  2. Step 2: Convert to fraction form
    128,341.64/176,926.20 = 87,991.50/x
  3. Step 3: Cross multiply
    128,341.64x = 176,926.20 × 87,991.50
  4. Step 4: Simplify right side
    128,341.64x = 15,568,001,727.30
  5. Step 5: Solve for x
    x = 15,568,001,727.30/128,341.64
  6. Step 6: Final answer
    x = 121,301.25

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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.