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Finding the Fourth Proportional to 631,763.28, 871,831.22 and 345,283.28

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Solution

The fourth proportional to 631,763.28, 871,831.22 and 345,283.28 is: 476,489.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,763.28 : 871,831.22 = 345,283.28 : x
  2. Step 2: Convert to fraction form
    631,763.28/871,831.22 = 345,283.28/x
  3. Step 3: Cross multiply
    631,763.28x = 871,831.22 × 345,283.28
  4. Step 4: Simplify right side
    631,763.28x = 301,028,743,248.00
  5. Step 5: Solve for x
    x = 301,028,743,248.00/631,763.28
  6. Step 6: Final answer
    x = 476,489.78

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Double scale
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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.