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Finding the Fourth Proportional to 70,415.20, 105,511.68 and 25,980.80

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Solution

The fourth proportional to 70,415.20, 105,511.68 and 25,980.80 is: 38,930.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,415.20 : 105,511.68 = 25,980.80 : x
  2. Step 2: Convert to fraction form
    70,415.20/105,511.68 = 25,980.80/x
  3. Step 3: Cross multiply
    70,415.20x = 105,511.68 × 25,980.80
  4. Step 4: Simplify right side
    70,415.20x = 2,741,277,855.74
  5. Step 5: Solve for x
    x = 2,741,277,855.74/70,415.20
  6. Step 6: Final answer
    x = 38,930.20

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1.5x scale

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.