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Finding the Fourth Proportional to 18,828.71, 28,208.63 and 8,815.08

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Solution

The fourth proportional to 18,828.71, 28,208.63 and 8,815.08 is: 13,206.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,828.71 : 28,208.63 = 8,815.08 : x
  2. Step 2: Convert to fraction form
    18,828.71/28,208.63 = 8,815.08/x
  3. Step 3: Cross multiply
    18,828.71x = 28,208.63 × 8,815.08
  4. Step 4: Simplify right side
    18,828.71x = 248,661,352.18
  5. Step 5: Solve for x
    x = 248,661,352.18/18,828.71
  6. Step 6: Final answer
    x = 13,206.50

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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.