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Finding the Fourth Proportional to 631,628.20, 871,649.10 and 345,148.28

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Solution

The fourth proportional to 631,628.20, 871,649.10 and 345,148.28 is: 476,305.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,628.20 : 871,649.10 = 345,148.28 : x
  2. Step 2: Convert to fraction form
    631,628.20/871,649.10 = 345,148.28/x
  3. Step 3: Cross multiply
    631,628.20x = 871,649.10 × 345,148.28
  4. Step 4: Simplify right side
    631,628.20x = 300,848,187,628.55
  5. Step 5: Solve for x
    x = 300,848,187,628.55/631,628.20
  6. Step 6: Final answer
    x = 476,305.82

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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.