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Finding the Fourth Proportional to 210,700.81, 315,748.05 and 90,724.81

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Solution

The fourth proportional to 210,700.81, 315,748.05 and 90,724.81 is: 135,956.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,700.81 : 315,748.05 = 90,724.81 : x
  2. Step 2: Convert to fraction form
    210,700.81/315,748.05 = 90,724.81/x
  3. Step 3: Cross multiply
    210,700.81x = 315,748.05 × 90,724.81
  4. Step 4: Simplify right side
    210,700.81x = 28,646,181,844.12
  5. Step 5: Solve for x
    x = 28,646,181,844.12/210,700.81
  6. Step 6: Final answer
    x = 135,956.68

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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.