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Finding the Fourth Proportional to 399,145.50, 550,820.79 and 272,043.14

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Solution

The fourth proportional to 399,145.50, 550,820.79 and 272,043.14 is: 375,419.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,145.50 : 550,820.79 = 272,043.14 : x
  2. Step 2: Convert to fraction form
    399,145.50/550,820.79 = 272,043.14/x
  3. Step 3: Cross multiply
    399,145.50x = 550,820.79 × 272,043.14
  4. Step 4: Simplify right side
    399,145.50x = 149,847,014,534.78
  5. Step 5: Solve for x
    x = 149,847,014,534.78/399,145.50
  6. Step 6: Final answer
    x = 375,419.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.