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Finding the Fourth Proportional to 401,330, 553,921.80 and 240,221

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Solution

The fourth proportional to 401,330, 553,921.80 and 240,221 is: 331,556.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,330 : 553,921.80 = 240,221 : x
  2. Step 2: Convert to fraction form
    401,330/553,921.80 = 240,221/x
  3. Step 3: Cross multiply
    401,330x = 553,921.80 × 240,221
  4. Step 4: Simplify right side
    401,330x = 133,063,648,717.80
  5. Step 5: Solve for x
    x = 133,063,648,717.80/401,330
  6. Step 6: Final answer
    x = 331,556.70

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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.