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Finding the Fourth Proportional to 15,719.30, 21,692.63 and 8,646.18

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Solution

The fourth proportional to 15,719.30, 21,692.63 and 8,646.18 is: 11,931.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719.30 : 21,692.63 = 8,646.18 : x
  2. Step 2: Convert to fraction form
    15,719.30/21,692.63 = 8,646.18/x
  3. Step 3: Cross multiply
    15,719.30x = 21,692.63 × 8,646.18
  4. Step 4: Simplify right side
    15,719.30x = 187,558,383.65
  5. Step 5: Solve for x
    x = 187,558,383.65/15,719.30
  6. Step 6: Final answer
    x = 11,931.73

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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.