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Finding the Fourth Proportional to 258,994.32, 388,490.92 and 81,516.84

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Solution

The fourth proportional to 258,994.32, 388,490.92 and 81,516.84 is: 122,275.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,994.32 : 388,490.92 = 81,516.84 : x
  2. Step 2: Convert to fraction form
    258,994.32/388,490.92 = 81,516.84/x
  3. Step 3: Cross multiply
    258,994.32x = 388,490.92 × 81,516.84
  4. Step 4: Simplify right side
    258,994.32x = 31,668,552,167.09
  5. Step 5: Solve for x
    x = 31,668,552,167.09/258,994.32
  6. Step 6: Final answer
    x = 122,275.08

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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.