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Finding the Fourth Proportional to 171,993.32, 257,889.76 and 66,689.28

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Solution

The fourth proportional to 171,993.32, 257,889.76 and 66,689.28 is: 99,995.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,993.32 : 257,889.76 = 66,689.28 : x
  2. Step 2: Convert to fraction form
    171,993.32/257,889.76 = 66,689.28/x
  3. Step 3: Cross multiply
    171,993.32x = 257,889.76 × 66,689.28
  4. Step 4: Simplify right side
    171,993.32x = 17,198,482,413.77
  5. Step 5: Solve for x
    x = 17,198,482,413.77/171,993.32
  6. Step 6: Final answer
    x = 99,995.06

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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.