Home / 390,936.35-539,542.98-218,919.81

Finding the Fourth Proportional to 390,936.35, 539,542.98 and 218,919.81

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Solution

The fourth proportional to 390,936.35, 539,542.98 and 218,919.81 is: 302,137.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,936.35 : 539,542.98 = 218,919.81 : x
  2. Step 2: Convert to fraction form
    390,936.35/539,542.98 = 218,919.81/x
  3. Step 3: Cross multiply
    390,936.35x = 539,542.98 × 218,919.81
  4. Step 4: Simplify right side
    390,936.35x = 118,116,646,668.43
  5. Step 5: Solve for x
    x = 118,116,646,668.43/390,936.35
  6. Step 6: Final answer
    x = 302,137.79

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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.