Home / 390,939.25-539,492.52-221,173.38

Finding the Fourth Proportional to 390,939.25, 539,492.52 and 221,173.38

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Solution

The fourth proportional to 390,939.25, 539,492.52 and 221,173.38 is: 305,217.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,939.25 : 539,492.52 = 221,173.38 : x
  2. Step 2: Convert to fraction form
    390,939.25/539,492.52 = 221,173.38/x
  3. Step 3: Cross multiply
    390,939.25x = 539,492.52 × 221,173.38
  4. Step 4: Simplify right side
    390,939.25x = 119,321,384,133.12
  5. Step 5: Solve for x
    x = 119,321,384,133.12/390,939.25
  6. Step 6: Final answer
    x = 305,217.20

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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.