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Finding the Fourth Proportional to 13,718.50, 18,930.01 and 7,748.91

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Solution

The fourth proportional to 13,718.50, 18,930.01 and 7,748.91 is: 10,692.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,718.50 : 18,930.01 = 7,748.91 : x
  2. Step 2: Convert to fraction form
    13,718.50/18,930.01 = 7,748.91/x
  3. Step 3: Cross multiply
    13,718.50x = 18,930.01 × 7,748.91
  4. Step 4: Simplify right side
    13,718.50x = 146,686,943.79
  5. Step 5: Solve for x
    x = 146,686,943.79/13,718.50
  6. Step 6: Final answer
    x = 10,692.64

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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.