Home / 390,949.88-539,507.18-221,184

Finding the Fourth Proportional to 390,949.88, 539,507.18 and 221,184

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Solution

The fourth proportional to 390,949.88, 539,507.18 and 221,184 is: 305,231.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,949.88 : 539,507.18 = 221,184 : x
  2. Step 2: Convert to fraction form
    390,949.88/539,507.18 = 221,184/x
  3. Step 3: Cross multiply
    390,949.88x = 539,507.18 × 221,184
  4. Step 4: Simplify right side
    390,949.88x = 119,330,356,654.08
  5. Step 5: Solve for x
    x = 119,330,356,654.08/390,949.88
  6. Step 6: Final answer
    x = 305,231.86

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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.