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Finding the Fourth Proportional to 18,477.70, 25,499.23 and 9,979.82

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Solution

The fourth proportional to 18,477.70, 25,499.23 and 9,979.82 is: 13,772.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,477.70 : 25,499.23 = 9,979.82 : x
  2. Step 2: Convert to fraction form
    18,477.70/25,499.23 = 9,979.82/x
  3. Step 3: Cross multiply
    18,477.70x = 25,499.23 × 9,979.82
  4. Step 4: Simplify right side
    18,477.70x = 254,477,812.15
  5. Step 5: Solve for x
    x = 254,477,812.15/18,477.70
  6. Step 6: Final answer
    x = 13,772.16

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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.