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Finding the Fourth Proportional to 448,688.20, 672,125.10 and 279,689.80

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Solution

The fourth proportional to 448,688.20, 672,125.10 and 279,689.80 is: 418,969.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    448,688.20 : 672,125.10 = 279,689.80 : x
  2. Step 2: Convert to fraction form
    448,688.20/672,125.10 = 279,689.80/x
  3. Step 3: Cross multiply
    448,688.20x = 672,125.10 × 279,689.80
  4. Step 4: Simplify right side
    448,688.20x = 187,986,534,793.98
  5. Step 5: Solve for x
    x = 187,986,534,793.98/448,688.20
  6. Step 6: Final answer
    x = 418,969.20

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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.