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Finding the Fourth Proportional to 631,327.61, 871,136.52 and 355,646.18

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Solution

The fourth proportional to 631,327.61, 871,136.52 and 355,646.18 is: 490,737.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,327.61 : 871,136.52 = 355,646.18 : x
  2. Step 2: Convert to fraction form
    631,327.61/871,136.52 = 355,646.18/x
  3. Step 3: Cross multiply
    631,327.61x = 871,136.52 × 355,646.18
  4. Step 4: Simplify right side
    631,327.61x = 309,816,376,090.85
  5. Step 5: Solve for x
    x = 309,816,376,090.85/631,327.61
  6. Step 6: Final answer
    x = 490,737.88

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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.