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Finding the Fourth Proportional to 10,212.60, 15,318.90 and 5,280.60

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Solution

The fourth proportional to 10,212.60, 15,318.90 and 5,280.60 is: 7,920.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,212.60 : 15,318.90 = 5,280.60 : x
  2. Step 2: Convert to fraction form
    10,212.60/15,318.90 = 5,280.60/x
  3. Step 3: Cross multiply
    10,212.60x = 15,318.90 × 5,280.60
  4. Step 4: Simplify right side
    10,212.60x = 80,892,983.34
  5. Step 5: Solve for x
    x = 80,892,983.34/10,212.60
  6. Step 6: Final answer
    x = 7,920.90

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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.