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Finding the Fourth Proportional to 631,761.78, 871,829.15 and 345,281.78

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Solution

The fourth proportional to 631,761.78, 871,829.15 and 345,281.78 is: 476,487.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,761.78 : 871,829.15 = 345,281.78 : x
  2. Step 2: Convert to fraction form
    631,761.78/871,829.15 = 345,281.78/x
  3. Step 3: Cross multiply
    631,761.78x = 871,829.15 × 345,281.78
  4. Step 4: Simplify right side
    631,761.78x = 301,026,720,767.89
  5. Step 5: Solve for x
    x = 301,026,720,767.89/631,761.78
  6. Step 6: Final answer
    x = 476,487.71

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1.5x scale

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.