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Finding the Fourth Proportional to 12,711.79, 17,541.44 and 7,121.71

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Solution

The fourth proportional to 12,711.79, 17,541.44 and 7,121.71 is: 9,827.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,711.79 : 17,541.44 = 7,121.71 : x
  2. Step 2: Convert to fraction form
    12,711.79/17,541.44 = 7,121.71/x
  3. Step 3: Cross multiply
    12,711.79x = 17,541.44 × 7,121.71
  4. Step 4: Simplify right side
    12,711.79x = 124,925,013.05
  5. Step 5: Solve for x
    x = 124,925,013.05/12,711.79
  6. Step 6: Final answer
    x = 9,827.49

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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.