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Finding the Fourth Proportional to 9,117.20, 12,790 and 9,117.20

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Solution

The fourth proportional to 9,117.20, 12,790 and 9,117.20 is: 12,790

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,117.20 : 12,790 = 9,117.20 : x
  2. Step 2: Convert to fraction form
    9,117.20/12,790 = 9,117.20/x
  3. Step 3: Cross multiply
    9,117.20x = 12,790 × 9,117.20
  4. Step 4: Simplify right side
    9,117.20x = 116,608,988.00
  5. Step 5: Solve for x
    x = 116,608,988.00/9,117.20
  6. Step 6: Final answer
    x = 12,790

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.