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Finding the Fourth Proportional to 128,081.49, 176,758.35 and 70,728.90

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Solution

The fourth proportional to 128,081.49, 176,758.35 and 70,728.90 is: 97,609.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,081.49 : 176,758.35 = 70,728.90 : x
  2. Step 2: Convert to fraction form
    128,081.49/176,758.35 = 70,728.90/x
  3. Step 3: Cross multiply
    128,081.49x = 176,758.35 × 70,728.90
  4. Step 4: Simplify right side
    128,081.49x = 12,501,923,661.32
  5. Step 5: Solve for x
    x = 12,501,923,661.32/128,081.49
  6. Step 6: Final answer
    x = 97,609.14

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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.