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Finding the Fourth Proportional to 70,145.20, 105,217.80 and 57,679.30

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Solution

The fourth proportional to 70,145.20, 105,217.80 and 57,679.30 is: 86,518.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,145.20 : 105,217.80 = 57,679.30 : x
  2. Step 2: Convert to fraction form
    70,145.20/105,217.80 = 57,679.30/x
  3. Step 3: Cross multiply
    70,145.20x = 105,217.80 × 57,679.30
  4. Step 4: Simplify right side
    70,145.20x = 6,068,889,051.54
  5. Step 5: Solve for x
    x = 6,068,889,051.54/70,145.20
  6. Step 6: Final answer
    x = 86,518.95

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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.