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Finding the Fourth Proportional to 70,276.80, 105,415.20 and 67,051.20

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Solution

The fourth proportional to 70,276.80, 105,415.20 and 67,051.20 is: 100,576.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,276.80 : 105,415.20 = 67,051.20 : x
  2. Step 2: Convert to fraction form
    70,276.80/105,415.20 = 67,051.20/x
  3. Step 3: Cross multiply
    70,276.80x = 105,415.20 × 67,051.20
  4. Step 4: Simplify right side
    70,276.80x = 7,068,215,658.24
  5. Step 5: Solve for x
    x = 7,068,215,658.24/70,276.80
  6. Step 6: Final answer
    x = 100,576.80

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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.