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Finding the Fourth Proportional to 66,009.54, 91,128.56 and 50,979.99

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Solution

The fourth proportional to 66,009.54, 91,128.56 and 50,979.99 is: 70,379.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,009.54 : 91,128.56 = 50,979.99 : x
  2. Step 2: Convert to fraction form
    66,009.54/91,128.56 = 50,979.99/x
  3. Step 3: Cross multiply
    66,009.54x = 91,128.56 × 50,979.99
  4. Step 4: Simplify right side
    66,009.54x = 4,645,733,077.51
  5. Step 5: Solve for x
    x = 4,645,733,077.51/66,009.54
  6. Step 6: Final answer
    x = 70,379.72

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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.