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Finding the Fourth Proportional to 631,628.78, 871,649.99 and 345,148.88

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Solution

The fourth proportional to 631,628.78, 871,649.99 and 345,148.88 is: 476,306.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,628.78 : 871,649.99 = 345,148.88 : x
  2. Step 2: Convert to fraction form
    631,628.78/871,649.99 = 345,148.88/x
  3. Step 3: Cross multiply
    631,628.78x = 871,649.99 × 345,148.88
  4. Step 4: Simplify right side
    631,628.78x = 300,849,011,716.52
  5. Step 5: Solve for x
    x = 300,849,011,716.52/631,628.78
  6. Step 6: Final answer
    x = 476,306.69

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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.