Home / 390,135.50-538,430.82-220,380.56

Finding the Fourth Proportional to 390,135.50, 538,430.82 and 220,380.56

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Solution

The fourth proportional to 390,135.50, 538,430.82 and 220,380.56 is: 304,149.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,135.50 : 538,430.82 = 220,380.56 : x
  2. Step 2: Convert to fraction form
    390,135.50/538,430.82 = 220,380.56/x
  3. Step 3: Cross multiply
    390,135.50x = 538,430.82 × 220,380.56
  4. Step 4: Simplify right side
    390,135.50x = 118,659,685,632.86
  5. Step 5: Solve for x
    x = 118,659,685,632.86/390,135.50
  6. Step 6: Final answer
    x = 304,149.93

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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.