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Finding the Fourth Proportional to 261,377.90, 391,541.79 and 221,224.58

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Solution

The fourth proportional to 261,377.90, 391,541.79 and 221,224.58 is: 331,392.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,377.90 : 391,541.79 = 221,224.58 : x
  2. Step 2: Convert to fraction form
    261,377.90/391,541.79 = 221,224.58/x
  3. Step 3: Cross multiply
    261,377.90x = 391,541.79 × 221,224.58
  4. Step 4: Simplify right side
    261,377.90x = 86,618,668,045.20
  5. Step 5: Solve for x
    x = 86,618,668,045.20/261,377.90
  6. Step 6: Final answer
    x = 331,392.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.