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Finding the Fourth Proportional to 18,784.79, 28,177.79 and 8,918.99

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Solution

The fourth proportional to 18,784.79, 28,177.79 and 8,918.99 is: 13,378.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,784.79 : 28,177.79 = 8,918.99 : x
  2. Step 2: Convert to fraction form
    18,784.79/28,177.79 = 8,918.99/x
  3. Step 3: Cross multiply
    18,784.79x = 28,177.79 × 8,918.99
  4. Step 4: Simplify right side
    18,784.79x = 251,317,241.75
  5. Step 5: Solve for x
    x = 251,317,241.75/18,784.79
  6. Step 6: Final answer
    x = 13,378.77

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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.