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Finding the Fourth Proportional to 390,859.73, 539,309.75 and 245,581.35

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Solution

The fourth proportional to 390,859.73, 539,309.75 and 245,581.35 is: 338,854.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,859.73 : 539,309.75 = 245,581.35 : x
  2. Step 2: Convert to fraction form
    390,859.73/539,309.75 = 245,581.35/x
  3. Step 3: Cross multiply
    390,859.73x = 539,309.75 × 245,581.35
  4. Step 4: Simplify right side
    390,859.73x = 132,444,414,189.48
  5. Step 5: Solve for x
    x = 132,444,414,189.48/390,859.73
  6. Step 6: Final answer
    x = 338,854.08

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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.