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Finding the Fourth Proportional to 18,477.81, 25,499.38 and 9,979.94

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Solution

The fourth proportional to 18,477.81, 25,499.38 and 9,979.94 is: 13,772.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,477.81 : 25,499.38 = 9,979.94 : x
  2. Step 2: Convert to fraction form
    18,477.81/25,499.38 = 9,979.94/x
  3. Step 3: Cross multiply
    18,477.81x = 25,499.38 × 9,979.94
  4. Step 4: Simplify right side
    18,477.81x = 254,482,105.04
  5. Step 5: Solve for x
    x = 254,482,105.04/18,477.81
  6. Step 6: Final answer
    x = 13,772.31

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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.