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Finding the Fourth Proportional to 18,821.61, 28,239.33 and 7,725.32

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Solution

The fourth proportional to 18,821.61, 28,239.33 and 7,725.32 is: 11,590.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.61 : 28,239.33 = 7,725.32 : x
  2. Step 2: Convert to fraction form
    18,821.61/28,239.33 = 7,725.32/x
  3. Step 3: Cross multiply
    18,821.61x = 28,239.33 × 7,725.32
  4. Step 4: Simplify right side
    18,821.61x = 218,157,854.51
  5. Step 5: Solve for x
    x = 218,157,854.51/18,821.61
  6. Step 6: Final answer
    x = 11,590.82

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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.