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Finding the Fourth Proportional to 70,484.52, 105,716.64 and 20,551.20

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Solution

The fourth proportional to 70,484.52, 105,716.64 and 20,551.20 is: 30,823.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,484.52 : 105,716.64 = 20,551.20 : x
  2. Step 2: Convert to fraction form
    70,484.52/105,716.64 = 20,551.20/x
  3. Step 3: Cross multiply
    70,484.52x = 105,716.64 × 20,551.20
  4. Step 4: Simplify right side
    70,484.52x = 2,172,603,811.97
  5. Step 5: Solve for x
    x = 2,172,603,811.97/70,484.52
  6. Step 6: Final answer
    x = 30,823.84

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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.