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Finding the Fourth Proportional to 15,718.66, 21,692.21 and 8,645.54

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Solution

The fourth proportional to 15,718.66, 21,692.21 and 8,645.54 is: 11,931.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,718.66 : 21,692.21 = 8,645.54 : x
  2. Step 2: Convert to fraction form
    15,718.66/21,692.21 = 8,645.54/x
  3. Step 3: Cross multiply
    15,718.66x = 21,692.21 × 8,645.54
  4. Step 4: Simplify right side
    15,718.66x = 187,540,869.24
  5. Step 5: Solve for x
    x = 187,540,869.24/15,718.66
  6. Step 6: Final answer
    x = 11,931.10

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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.