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Finding the Fourth Proportional to 210,504.91, 315,982.14 and 90,621.20

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Solution

The fourth proportional to 210,504.91, 315,982.14 and 90,621.20 is: 136,028.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,504.91 : 315,982.14 = 90,621.20 : x
  2. Step 2: Convert to fraction form
    210,504.91/315,982.14 = 90,621.20/x
  3. Step 3: Cross multiply
    210,504.91x = 315,982.14 × 90,621.20
  4. Step 4: Simplify right side
    210,504.91x = 28,634,679,125.46
  5. Step 5: Solve for x
    x = 28,634,679,125.46/210,504.91
  6. Step 6: Final answer
    x = 136,028.56

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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.