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Finding the Fourth Proportional to 631,857.20, 871,962.92 and 345,378.42

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Solution

The fourth proportional to 631,857.20, 871,962.92 and 345,378.42 is: 476,622.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,857.20 : 871,962.92 = 345,378.42 : x
  2. Step 2: Convert to fraction form
    631,857.20/871,962.92 = 345,378.42/x
  3. Step 3: Cross multiply
    631,857.20x = 871,962.92 × 345,378.42
  4. Step 4: Simplify right side
    631,857.20x = 301,157,173,881.29
  5. Step 5: Solve for x
    x = 301,157,173,881.29/631,857.20
  6. Step 6: Final answer
    x = 476,622.21

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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.