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Finding the Fourth Proportional to 15,692.45, 21,656.09 and 8,619.53

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Solution

The fourth proportional to 15,692.45, 21,656.09 and 8,619.53 is: 11,895.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,692.45 : 21,656.09 = 8,619.53 : x
  2. Step 2: Convert to fraction form
    15,692.45/21,656.09 = 8,619.53/x
  3. Step 3: Cross multiply
    15,692.45x = 21,656.09 × 8,619.53
  4. Step 4: Simplify right side
    15,692.45x = 186,665,230.71
  5. Step 5: Solve for x
    x = 186,665,230.71/15,692.45
  6. Step 6: Final answer
    x = 11,895.23

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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.