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Finding the Fourth Proportional to 390,843, 539,363.52 and 221,073.48

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Solution

The fourth proportional to 390,843, 539,363.52 and 221,073.48 is: 305,081.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,843 : 539,363.52 = 221,073.48 : x
  2. Step 2: Convert to fraction form
    390,843/539,363.52 = 221,073.48/x
  3. Step 3: Cross multiply
    390,843x = 539,363.52 × 221,073.48
  4. Step 4: Simplify right side
    390,843x = 119,238,970,351.45
  5. Step 5: Solve for x
    x = 119,238,970,351.45/390,843
  6. Step 6: Final answer
    x = 305,081.50

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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.