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Finding the Fourth Proportional to 216,988.80, 325,499.40 and 76,729.20

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Solution

The fourth proportional to 216,988.80, 325,499.40 and 76,729.20 is: 115,099.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,988.80 : 325,499.40 = 76,729.20 : x
  2. Step 2: Convert to fraction form
    216,988.80/325,499.40 = 76,729.20/x
  3. Step 3: Cross multiply
    216,988.80x = 325,499.40 × 76,729.20
  4. Step 4: Simplify right side
    216,988.80x = 24,975,308,562.48
  5. Step 5: Solve for x
    x = 24,975,308,562.48/216,988.80
  6. Step 6: Final answer
    x = 115,099.53

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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.