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Finding the Fourth Proportional to 128,005.83, 176,516.96 and 84,970.13

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Solution

The fourth proportional to 128,005.83, 176,516.96 and 84,970.13 is: 117,171.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,005.83 : 176,516.96 = 84,970.13 : x
  2. Step 2: Convert to fraction form
    128,005.83/176,516.96 = 84,970.13/x
  3. Step 3: Cross multiply
    128,005.83x = 176,516.96 × 84,970.13
  4. Step 4: Simplify right side
    128,005.83x = 14,998,667,730.97
  5. Step 5: Solve for x
    x = 14,998,667,730.97/128,005.83
  6. Step 6: Final answer
    x = 117,171.75

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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.