Home / 390,938.25-539,491.14-221,172.38

Finding the Fourth Proportional to 390,938.25, 539,491.14 and 221,172.38

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Solution

The fourth proportional to 390,938.25, 539,491.14 and 221,172.38 is: 305,215.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,938.25 : 539,491.14 = 221,172.38 : x
  2. Step 2: Convert to fraction form
    390,938.25/539,491.14 = 221,172.38/x
  3. Step 3: Cross multiply
    390,938.25x = 539,491.14 × 221,172.38
  4. Step 4: Simplify right side
    390,938.25x = 119,320,536,725.26
  5. Step 5: Solve for x
    x = 119,320,536,725.26/390,938.25
  6. Step 6: Final answer
    x = 305,215.82

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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.