Home / 391,021.48-539,573.70-221,228.20

Finding the Fourth Proportional to 391,021.48, 539,573.70 and 221,228.20

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Solution

The fourth proportional to 391,021.48, 539,573.70 and 221,228.20 is: 305,274.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,021.48 : 539,573.70 = 221,228.20 : x
  2. Step 2: Convert to fraction form
    391,021.48/539,573.70 = 221,228.20/x
  3. Step 3: Cross multiply
    391,021.48x = 539,573.70 × 221,228.20
  4. Step 4: Simplify right side
    391,021.48x = 119,368,918,418.34
  5. Step 5: Solve for x
    x = 119,368,918,418.34/391,021.48
  6. Step 6: Final answer
    x = 305,274.58

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1.5x scale

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.