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Finding the Fourth Proportional to 390,982.41, 539,541 and 221,220.18

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Solution

The fourth proportional to 390,982.41, 539,541 and 221,220.18 is: 305,275.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,982.41 : 539,541 = 221,220.18 : x
  2. Step 2: Convert to fraction form
    390,982.41/539,541 = 221,220.18/x
  3. Step 3: Cross multiply
    390,982.41x = 539,541 × 221,220.18
  4. Step 4: Simplify right side
    390,982.41x = 119,357,357,137.38
  5. Step 5: Solve for x
    x = 119,357,357,137.38/390,982.41
  6. Step 6: Final answer
    x = 305,275.52

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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.