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Finding the Fourth Proportional to 190,685.88, 285,988.32 and 72,315.72

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Solution

The fourth proportional to 190,685.88, 285,988.32 and 72,315.72 is: 108,458.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    190,685.88 : 285,988.32 = 72,315.72 : x
  2. Step 2: Convert to fraction form
    190,685.88/285,988.32 = 72,315.72/x
  3. Step 3: Cross multiply
    190,685.88x = 285,988.32 × 72,315.72
  4. Step 4: Simplify right side
    190,685.88x = 20,681,451,272.39
  5. Step 5: Solve for x
    x = 20,681,451,272.39/190,685.88
  6. Step 6: Final answer
    x = 108,458.22

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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.