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Finding the Fourth Proportional to 190,686.88, 285,989.82 and 72,316.72

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Solution

The fourth proportional to 190,686.88, 285,989.82 and 72,316.72 is: 108,459.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    190,686.88 : 285,989.82 = 72,316.72 : x
  2. Step 2: Convert to fraction form
    190,686.88/285,989.82 = 72,316.72/x
  3. Step 3: Cross multiply
    190,686.88x = 285,989.82 × 72,316.72
  4. Step 4: Simplify right side
    190,686.88x = 20,681,845,735.79
  5. Step 5: Solve for x
    x = 20,681,845,735.79/190,686.88
  6. Step 6: Final answer
    x = 108,459.72

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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.