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Finding the Fourth Proportional to 15,520.77, 21,420.87 and 8,808.06

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Solution

The fourth proportional to 15,520.77, 21,420.87 and 8,808.06 is: 12,156.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,520.77 : 21,420.87 = 8,808.06 : x
  2. Step 2: Convert to fraction form
    15,520.77/21,420.87 = 8,808.06/x
  3. Step 3: Cross multiply
    15,520.77x = 21,420.87 × 8,808.06
  4. Step 4: Simplify right side
    15,520.77x = 188,676,308.21
  5. Step 5: Solve for x
    x = 188,676,308.21/15,520.77
  6. Step 6: Final answer
    x = 12,156.38

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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.