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Finding the Fourth Proportional to 128,015.51, 176,661.41 and 71,426.88

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Solution

The fourth proportional to 128,015.51, 176,661.41 and 71,426.88 is: 98,569.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,015.51 : 176,661.41 = 71,426.88 : x
  2. Step 2: Convert to fraction form
    128,015.51/176,661.41 = 71,426.88/x
  3. Step 3: Cross multiply
    128,015.51x = 176,661.41 × 71,426.88
  4. Step 4: Simplify right side
    128,015.51x = 12,618,372,975.57
  5. Step 5: Solve for x
    x = 12,618,372,975.57/128,015.51
  6. Step 6: Final answer
    x = 98,569.10

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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.