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Finding the Fourth Proportional to 15,719.40, 21,692.60 and 8,645.92

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Solution

The fourth proportional to 15,719.40, 21,692.60 and 8,645.92 is: 11,931.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719.40 : 21,692.60 = 8,645.92 : x
  2. Step 2: Convert to fraction form
    15,719.40/21,692.60 = 8,645.92/x
  3. Step 3: Cross multiply
    15,719.40x = 21,692.60 × 8,645.92
  4. Step 4: Simplify right side
    15,719.40x = 187,552,484.19
  5. Step 5: Solve for x
    x = 187,552,484.19/15,719.40
  6. Step 6: Final answer
    x = 11,931.27

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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.