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Finding the Fourth Proportional to 15,765.75, 21,756.74 and 8,692.32

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Solution

The fourth proportional to 15,765.75, 21,756.74 and 8,692.32 is: 11,995.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,765.75 : 21,756.74 = 8,692.32 : x
  2. Step 2: Convert to fraction form
    15,765.75/21,756.74 = 8,692.32/x
  3. Step 3: Cross multiply
    15,765.75x = 21,756.74 × 8,692.32
  4. Step 4: Simplify right side
    15,765.75x = 189,116,502.78
  5. Step 5: Solve for x
    x = 189,116,502.78/15,765.75
  6. Step 6: Final answer
    x = 11,995.40

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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.