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Finding the Fourth Proportional to 210,019.60, 315,090.42 and 67,861.90

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Solution

The fourth proportional to 210,019.60, 315,090.42 and 67,861.90 is: 101,812.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,019.60 : 315,090.42 = 67,861.90 : x
  2. Step 2: Convert to fraction form
    210,019.60/315,090.42 = 67,861.90/x
  3. Step 3: Cross multiply
    210,019.60x = 315,090.42 × 67,861.90
  4. Step 4: Simplify right side
    210,019.60x = 21,382,634,573.00
  5. Step 5: Solve for x
    x = 21,382,634,573.00/210,019.60
  6. Step 6: Final answer
    x = 101,812.57

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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.