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Finding the Fourth Proportional to 13,812.51, 20,717.86 and 5,915.01

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Solution

The fourth proportional to 13,812.51, 20,717.86 and 5,915.01 is: 8,872.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812.51 : 20,717.86 = 5,915.01 : x
  2. Step 2: Convert to fraction form
    13,812.51/20,717.86 = 5,915.01/x
  3. Step 3: Cross multiply
    13,812.51x = 20,717.86 × 5,915.01
  4. Step 4: Simplify right side
    13,812.51x = 122,546,349.08
  5. Step 5: Solve for x
    x = 122,546,349.08/13,812.51
  6. Step 6: Final answer
    x = 8,872.13

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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.