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Finding the Fourth Proportional to 9,990.76, 13,753.38 and 8,585.32

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Solution

The fourth proportional to 9,990.76, 13,753.38 and 8,585.32 is: 11,818.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.76 : 13,753.38 = 8,585.32 : x
  2. Step 2: Convert to fraction form
    9,990.76/13,753.38 = 8,585.32/x
  3. Step 3: Cross multiply
    9,990.76x = 13,753.38 × 8,585.32
  4. Step 4: Simplify right side
    9,990.76x = 118,077,168.38
  5. Step 5: Solve for x
    x = 118,077,168.38/9,990.76
  6. Step 6: Final answer
    x = 11,818.64

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.