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Finding the Fourth Proportional to 18,886.23, 28,304.71 and 7,781.74

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Solution

The fourth proportional to 18,886.23, 28,304.71 and 7,781.74 is: 11,662.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,886.23 : 28,304.71 = 7,781.74 : x
  2. Step 2: Convert to fraction form
    18,886.23/28,304.71 = 7,781.74/x
  3. Step 3: Cross multiply
    18,886.23x = 28,304.71 × 7,781.74
  4. Step 4: Simplify right side
    18,886.23x = 220,259,803.78
  5. Step 5: Solve for x
    x = 220,259,803.78/18,886.23
  6. Step 6: Final answer
    x = 11,662.45

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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.