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Finding the Fourth Proportional to 15,120.16, 20,870.94 and 8,837.80

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Solution

The fourth proportional to 15,120.16, 20,870.94 and 8,837.80 is: 12,199.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120.16 : 20,870.94 = 8,837.80 : x
  2. Step 2: Convert to fraction form
    15,120.16/20,870.94 = 8,837.80/x
  3. Step 3: Cross multiply
    15,120.16x = 20,870.94 × 8,837.80
  4. Step 4: Simplify right side
    15,120.16x = 184,453,193.53
  5. Step 5: Solve for x
    x = 184,453,193.53/15,120.16
  6. Step 6: Final answer
    x = 12,199.16

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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.