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Finding the Fourth Proportional to 12,605.70, 18,900.45 and 5,213.10

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Solution

The fourth proportional to 12,605.70, 18,900.45 and 5,213.10 is: 7,816.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,605.70 : 18,900.45 = 5,213.10 : x
  2. Step 2: Convert to fraction form
    12,605.70/18,900.45 = 5,213.10/x
  3. Step 3: Cross multiply
    12,605.70x = 18,900.45 × 5,213.10
  4. Step 4: Simplify right side
    12,605.70x = 98,529,935.90
  5. Step 5: Solve for x
    x = 98,529,935.90/12,605.70
  6. Step 6: Final answer
    x = 7,816.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.