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Finding the Fourth Proportional to 115,431.80, 173,147.70 and 102,990.20

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Solution

The fourth proportional to 115,431.80, 173,147.70 and 102,990.20 is: 154,485.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,431.80 : 173,147.70 = 102,990.20 : x
  2. Step 2: Convert to fraction form
    115,431.80/173,147.70 = 102,990.20/x
  3. Step 3: Cross multiply
    115,431.80x = 173,147.70 × 102,990.20
  4. Step 4: Simplify right side
    115,431.80x = 17,832,516,252.54
  5. Step 5: Solve for x
    x = 17,832,516,252.54/115,431.80
  6. Step 6: Final answer
    x = 154,485.30

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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.