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Finding the Fourth Proportional to 11,520.10, 17,280.15 and 5,280.10

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Solution

The fourth proportional to 11,520.10, 17,280.15 and 5,280.10 is: 7,920.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,520.10 : 17,280.15 = 5,280.10 : x
  2. Step 2: Convert to fraction form
    11,520.10/17,280.15 = 5,280.10/x
  3. Step 3: Cross multiply
    11,520.10x = 17,280.15 × 5,280.10
  4. Step 4: Simplify right side
    11,520.10x = 91,240,920.02
  5. Step 5: Solve for x
    x = 91,240,920.02/11,520.10
  6. Step 6: Final answer
    x = 7,920.15

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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.