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Finding the Fourth Proportional to 661,195.98, 991,715.13 and 391,485.42

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Solution

The fourth proportional to 661,195.98, 991,715.13 and 391,485.42 is: 587,181.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,195.98 : 991,715.13 = 391,485.42 : x
  2. Step 2: Convert to fraction form
    661,195.98/991,715.13 = 391,485.42/x
  3. Step 3: Cross multiply
    661,195.98x = 991,715.13 × 391,485.42
  4. Step 4: Simplify right side
    661,195.98x = 388,242,014,188.41
  5. Step 5: Solve for x
    x = 388,242,014,188.41/661,195.98
  6. Step 6: Final answer
    x = 587,181.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.