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Finding the Fourth Proportional to 421,227.39, 631,998.86 and 218,697.07

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Solution

The fourth proportional to 421,227.39, 631,998.86 and 218,697.07 is: 328,127.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,227.39 : 631,998.86 = 218,697.07 : x
  2. Step 2: Convert to fraction form
    421,227.39/631,998.86 = 218,697.07/x
  3. Step 3: Cross multiply
    421,227.39x = 631,998.86 × 218,697.07
  4. Step 4: Simplify right side
    421,227.39x = 138,216,298,925.34
  5. Step 5: Solve for x
    x = 138,216,298,925.34/421,227.39
  6. Step 6: Final answer
    x = 328,127.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.