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Finding the Fourth Proportional to 70,904.72, 106,381.68 and 31,489.52

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Solution

The fourth proportional to 70,904.72, 106,381.68 and 31,489.52 is: 47,245.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,904.72 : 106,381.68 = 31,489.52 : x
  2. Step 2: Convert to fraction form
    70,904.72/106,381.68 = 31,489.52/x
  3. Step 3: Cross multiply
    70,904.72x = 106,381.68 × 31,489.52
  4. Step 4: Simplify right side
    70,904.72x = 3,349,908,039.99
  5. Step 5: Solve for x
    x = 3,349,908,039.99/70,904.72
  6. Step 6: Final answer
    x = 47,245.21

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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.