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Finding the Fourth Proportional to 15,776.85, 21,771.39 and 8,703.12

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Solution

The fourth proportional to 15,776.85, 21,771.39 and 8,703.12 is: 12,009.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,776.85 : 21,771.39 = 8,703.12 : x
  2. Step 2: Convert to fraction form
    15,776.85/21,771.39 = 8,703.12/x
  3. Step 3: Cross multiply
    15,776.85x = 21,771.39 × 8,703.12
  4. Step 4: Simplify right side
    15,776.85x = 189,479,019.74
  5. Step 5: Solve for x
    x = 189,479,019.74/15,776.85
  6. Step 6: Final answer
    x = 12,009.94

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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.