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Finding the Fourth Proportional to 70,216.76, 105,325.12 and 28,115.80

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Solution

The fourth proportional to 70,216.76, 105,325.12 and 28,115.80 is: 42,173.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,216.76 : 105,325.12 = 28,115.80 : x
  2. Step 2: Convert to fraction form
    70,216.76/105,325.12 = 28,115.80/x
  3. Step 3: Cross multiply
    70,216.76x = 105,325.12 × 28,115.80
  4. Step 4: Simplify right side
    70,216.76x = 2,961,300,008.90
  5. Step 5: Solve for x
    x = 2,961,300,008.90/70,216.76
  6. Step 6: Final answer
    x = 42,173.69

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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.