Home / 390,934.85-539,540.91-218,918.31

Finding the Fourth Proportional to 390,934.85, 539,540.91 and 218,918.31

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Solution

The fourth proportional to 390,934.85, 539,540.91 and 218,918.31 is: 302,135.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,934.85 : 539,540.91 = 218,918.31 : x
  2. Step 2: Convert to fraction form
    390,934.85/539,540.91 = 218,918.31/x
  3. Step 3: Cross multiply
    390,934.85x = 539,540.91 × 218,918.31
  4. Step 4: Simplify right side
    390,934.85x = 118,115,384,193.06
  5. Step 5: Solve for x
    x = 118,115,384,193.06/390,934.85
  6. Step 6: Final answer
    x = 302,135.73

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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.