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Finding the Fourth Proportional to 18,904.88, 28,357.32 and 9,038.78

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Solution

The fourth proportional to 18,904.88, 28,357.32 and 9,038.78 is: 13,558.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,904.88 : 28,357.32 = 9,038.78 : x
  2. Step 2: Convert to fraction form
    18,904.88/28,357.32 = 9,038.78/x
  3. Step 3: Cross multiply
    18,904.88x = 28,357.32 × 9,038.78
  4. Step 4: Simplify right side
    18,904.88x = 256,315,576.87
  5. Step 5: Solve for x
    x = 256,315,576.87/18,904.88
  6. Step 6: Final answer
    x = 13,558.17

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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.