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Finding the Fourth Proportional to 115,043.80, 172,368.60 and 91,424.20

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Solution

The fourth proportional to 115,043.80, 172,368.60 and 91,424.20 is: 136,979.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,043.80 : 172,368.60 = 91,424.20 : x
  2. Step 2: Convert to fraction form
    115,043.80/172,368.60 = 91,424.20/x
  3. Step 3: Cross multiply
    115,043.80x = 172,368.60 × 91,424.20
  4. Step 4: Simplify right side
    115,043.80x = 15,758,661,360.12
  5. Step 5: Solve for x
    x = 15,758,661,360.12/115,043.80
  6. Step 6: Final answer
    x = 136,979.67

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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.