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Finding the Fourth Proportional to 631,719.29, 871,770.70 and 345,239.40

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Solution

The fourth proportional to 631,719.29, 871,770.70 and 345,239.40 is: 476,429.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,719.29 : 871,770.70 = 345,239.40 : x
  2. Step 2: Convert to fraction form
    631,719.29/871,770.70 = 345,239.40/x
  3. Step 3: Cross multiply
    631,719.29x = 871,770.70 × 345,239.40
  4. Step 4: Simplify right side
    631,719.29x = 300,969,592,202.56
  5. Step 5: Solve for x
    x = 300,969,592,202.56/631,719.29
  6. Step 6: Final answer
    x = 476,429.32

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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.