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Finding the Fourth Proportional to 15,581.16, 21,501.55 and 8,775.03

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Solution

The fourth proportional to 15,581.16, 21,501.55 and 8,775.03 is: 12,109.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,581.16 : 21,501.55 = 8,775.03 : x
  2. Step 2: Convert to fraction form
    15,581.16/21,501.55 = 8,775.03/x
  3. Step 3: Cross multiply
    15,581.16x = 21,501.55 × 8,775.03
  4. Step 4: Simplify right side
    15,581.16x = 188,676,837.90
  5. Step 5: Solve for x
    x = 188,676,837.90/15,581.16
  6. Step 6: Final answer
    x = 12,109.29

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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.