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Finding the Fourth Proportional to 259,281.50, 388,987.86 and 72,293

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Solution

The fourth proportional to 259,281.50, 388,987.86 and 72,293 is: 108,457.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,281.50 : 388,987.86 = 72,293 : x
  2. Step 2: Convert to fraction form
    259,281.50/388,987.86 = 72,293/x
  3. Step 3: Cross multiply
    259,281.50x = 388,987.86 × 72,293
  4. Step 4: Simplify right side
    259,281.50x = 28,121,099,362.98
  5. Step 5: Solve for x
    x = 28,121,099,362.98/259,281.50
  6. Step 6: Final answer
    x = 108,457.79

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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.