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Finding the Fourth Proportional to 70,397.81, 105,606.99 and 20,471.43

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Solution

The fourth proportional to 70,397.81, 105,606.99 and 20,471.43 is: 30,710.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,397.81 : 105,606.99 = 20,471.43 : x
  2. Step 2: Convert to fraction form
    70,397.81/105,606.99 = 20,471.43/x
  3. Step 3: Cross multiply
    70,397.81x = 105,606.99 × 20,471.43
  4. Step 4: Simplify right side
    70,397.81x = 2,161,926,499.32
  5. Step 5: Solve for x
    x = 2,161,926,499.32/70,397.81
  6. Step 6: Final answer
    x = 30,710.14

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1.5x scale

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.