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Finding the Fourth Proportional to 18,673.79, 28,012.74 and 7,578.87

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Solution

The fourth proportional to 18,673.79, 28,012.74 and 7,578.87 is: 11,369.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,673.79 : 28,012.74 = 7,578.87 : x
  2. Step 2: Convert to fraction form
    18,673.79/28,012.74 = 7,578.87/x
  3. Step 3: Cross multiply
    18,673.79x = 28,012.74 × 7,578.87
  4. Step 4: Simplify right side
    18,673.79x = 212,304,781.34
  5. Step 5: Solve for x
    x = 212,304,781.34/18,673.79
  6. Step 6: Final answer
    x = 11,369.13

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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.