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Finding the Fourth Proportional to 128,081.72, 176,740.04 and 70,717.32

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Solution

The fourth proportional to 128,081.72, 176,740.04 and 70,717.32 is: 97,582.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,081.72 : 176,740.04 = 70,717.32 : x
  2. Step 2: Convert to fraction form
    128,081.72/176,740.04 = 70,717.32/x
  3. Step 3: Cross multiply
    128,081.72x = 176,740.04 × 70,717.32
  4. Step 4: Simplify right side
    128,081.72x = 12,498,581,965.49
  5. Step 5: Solve for x
    x = 12,498,581,965.49/128,081.72
  6. Step 6: Final answer
    x = 97,582.87

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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.