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Finding the Fourth Proportional to 70,247.60, 105,320.20 and 28,673.20

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Solution

The fourth proportional to 70,247.60, 105,320.20 and 28,673.20 is: 42,988.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,247.60 : 105,320.20 = 28,673.20 : x
  2. Step 2: Convert to fraction form
    70,247.60/105,320.20 = 28,673.20/x
  3. Step 3: Cross multiply
    70,247.60x = 105,320.20 × 28,673.20
  4. Step 4: Simplify right side
    70,247.60x = 3,019,867,158.64
  5. Step 5: Solve for x
    x = 3,019,867,158.64/70,247.60
  6. Step 6: Final answer
    x = 42,988.90

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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.