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Finding the Fourth Proportional to 354,637.80, 531,239.90 and 221,108.20

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Solution

The fourth proportional to 354,637.80, 531,239.90 and 221,108.20 is: 331,215.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,637.80 : 531,239.90 = 221,108.20 : x
  2. Step 2: Convert to fraction form
    354,637.80/531,239.90 = 221,108.20/x
  3. Step 3: Cross multiply
    354,637.80x = 531,239.90 × 221,108.20
  4. Step 4: Simplify right side
    354,637.80x = 117,461,498,057.18
  5. Step 5: Solve for x
    x = 117,461,498,057.18/354,637.80
  6. Step 6: Final answer
    x = 331,215.39

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1.5x scale

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.