Home / 390,173.87-538,438.38-218,091.65

Finding the Fourth Proportional to 390,173.87, 538,438.38 and 218,091.65

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Solution

The fourth proportional to 390,173.87, 538,438.38 and 218,091.65 is: 300,965.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,173.87 : 538,438.38 = 218,091.65 : x
  2. Step 2: Convert to fraction form
    390,173.87/538,438.38 = 218,091.65/x
  3. Step 3: Cross multiply
    390,173.87x = 538,438.38 × 218,091.65
  4. Step 4: Simplify right side
    390,173.87x = 117,428,910,934.88
  5. Step 5: Solve for x
    x = 117,428,910,934.88/390,173.87
  6. Step 6: Final answer
    x = 300,965.60

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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.