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Finding the Fourth Proportional to 70,913.68, 106,369.28 and 20,993.52

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Solution

The fourth proportional to 70,913.68, 106,369.28 and 20,993.52 is: 31,489.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,913.68 : 106,369.28 = 20,993.52 : x
  2. Step 2: Convert to fraction form
    70,913.68/106,369.28 = 20,993.52/x
  3. Step 3: Cross multiply
    70,913.68x = 106,369.28 × 20,993.52
  4. Step 4: Simplify right side
    70,913.68x = 2,233,065,607.07
  5. Step 5: Solve for x
    x = 2,233,065,607.07/70,913.68
  6. Step 6: Final answer
    x = 31,489.91

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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.