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Finding the Fourth Proportional to 129,920.32, 194,900.80 and 55,040.64

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Solution

The fourth proportional to 129,920.32, 194,900.80 and 55,040.64 is: 82,569.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,920.32 : 194,900.80 = 55,040.64 : x
  2. Step 2: Convert to fraction form
    129,920.32/194,900.80 = 55,040.64/x
  3. Step 3: Cross multiply
    129,920.32x = 194,900.80 × 55,040.64
  4. Step 4: Simplify right side
    129,920.32x = 10,727,464,768.51
  5. Step 5: Solve for x
    x = 10,727,464,768.51/129,920.32
  6. Step 6: Final answer
    x = 82,569.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.