Home / 391,187.12-539,835-221,419.76

Finding the Fourth Proportional to 391,187.12, 539,835 and 221,419.76

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Solution

The fourth proportional to 391,187.12, 539,835 and 221,419.76 is: 305,557.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,187.12 : 539,835 = 221,419.76 : x
  2. Step 2: Convert to fraction form
    391,187.12/539,835 = 221,419.76/x
  3. Step 3: Cross multiply
    391,187.12x = 539,835 × 221,419.76
  4. Step 4: Simplify right side
    391,187.12x = 119,530,136,139.60
  5. Step 5: Solve for x
    x = 119,530,136,139.60/391,187.12
  6. Step 6: Final answer
    x = 305,557.44

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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.