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Finding the Fourth Proportional to 13,621.51, 18,791.01 and 8,307.10

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Solution

The fourth proportional to 13,621.51, 18,791.01 and 8,307.10 is: 11,459.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,621.51 : 18,791.01 = 8,307.10 : x
  2. Step 2: Convert to fraction form
    13,621.51/18,791.01 = 8,307.10/x
  3. Step 3: Cross multiply
    13,621.51x = 18,791.01 × 8,307.10
  4. Step 4: Simplify right side
    13,621.51x = 156,098,752.19
  5. Step 5: Solve for x
    x = 156,098,752.19/13,621.51
  6. Step 6: Final answer
    x = 11,459.73

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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.