Home / 390,965.28-539,543.46-221,195.76

Finding the Fourth Proportional to 390,965.28, 539,543.46 and 221,195.76

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Solution

The fourth proportional to 390,965.28, 539,543.46 and 221,195.76 is: 305,256.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,965.28 : 539,543.46 = 221,195.76 : x
  2. Step 2: Convert to fraction form
    390,965.28/539,543.46 = 221,195.76/x
  3. Step 3: Cross multiply
    390,965.28x = 539,543.46 × 221,195.76
  4. Step 4: Simplify right side
    390,965.28x = 119,344,725,687.73
  5. Step 5: Solve for x
    x = 119,344,725,687.73/390,965.28
  6. Step 6: Final answer
    x = 305,256.58

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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.