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Finding the Fourth Proportional to 8,815, 12,165.18 and 5,090.20

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Solution

The fourth proportional to 8,815, 12,165.18 and 5,090.20 is: 7,024.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,815 : 12,165.18 = 5,090.20 : x
  2. Step 2: Convert to fraction form
    8,815/12,165.18 = 5,090.20/x
  3. Step 3: Cross multiply
    8,815x = 12,165.18 × 5,090.20
  4. Step 4: Simplify right side
    8,815x = 61,923,199.24
  5. Step 5: Solve for x
    x = 61,923,199.24/8,815
  6. Step 6: Final answer
    x = 7,024.75

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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.