Home / 390,983.41-539,542.38-221,221.18

Finding the Fourth Proportional to 390,983.41, 539,542.38 and 221,221.18

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Solution

The fourth proportional to 390,983.41, 539,542.38 and 221,221.18 is: 305,276.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,983.41 : 539,542.38 = 221,221.18 : x
  2. Step 2: Convert to fraction form
    390,983.41/539,542.38 = 221,221.18/x
  3. Step 3: Cross multiply
    390,983.41x = 539,542.38 × 221,221.18
  4. Step 4: Simplify right side
    390,983.41x = 119,358,201,963.61
  5. Step 5: Solve for x
    x = 119,358,201,963.61/390,983.41
  6. Step 6: Final answer
    x = 305,276.90

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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.