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Finding the Fourth Proportional to 15,692.61, 21,652.65 and 9,318.09

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Solution

The fourth proportional to 15,692.61, 21,652.65 and 9,318.09 is: 12,857.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,692.61 : 21,652.65 = 9,318.09 : x
  2. Step 2: Convert to fraction form
    15,692.61/21,652.65 = 9,318.09/x
  3. Step 3: Cross multiply
    15,692.61x = 21,652.65 × 9,318.09
  4. Step 4: Simplify right side
    15,692.61x = 201,761,341.44
  5. Step 5: Solve for x
    x = 201,761,341.44/15,692.61
  6. Step 6: Final answer
    x = 12,857.09

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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.