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Finding the Fourth Proportional to 258,999.80, 388,499.70 and 72,011.30

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Solution

The fourth proportional to 258,999.80, 388,499.70 and 72,011.30 is: 108,016.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,999.80 : 388,499.70 = 72,011.30 : x
  2. Step 2: Convert to fraction form
    258,999.80/388,499.70 = 72,011.30/x
  3. Step 3: Cross multiply
    258,999.80x = 388,499.70 × 72,011.30
  4. Step 4: Simplify right side
    258,999.80x = 27,976,368,446.61
  5. Step 5: Solve for x
    x = 27,976,368,446.61/258,999.80
  6. Step 6: Final answer
    x = 108,016.95

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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.