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Finding the Fourth Proportional to 15,771.84, 21,765.12 and 8,698.29

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Solution

The fourth proportional to 15,771.84, 21,765.12 and 8,698.29 is: 12,003.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,771.84 : 21,765.12 = 8,698.29 : x
  2. Step 2: Convert to fraction form
    15,771.84/21,765.12 = 8,698.29/x
  3. Step 3: Cross multiply
    15,771.84x = 21,765.12 × 8,698.29
  4. Step 4: Simplify right side
    15,771.84x = 189,319,325.64
  5. Step 5: Solve for x
    x = 189,319,325.64/15,771.84
  6. Step 6: Final answer
    x = 12,003.63

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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.