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Finding the Fourth Proportional to 18,916.90, 28,356.78 and 7,061.98

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Solution

The fourth proportional to 18,916.90, 28,356.78 and 7,061.98 is: 10,586.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.90 : 28,356.78 = 7,061.98 : x
  2. Step 2: Convert to fraction form
    18,916.90/28,356.78 = 7,061.98/x
  3. Step 3: Cross multiply
    18,916.90x = 28,356.78 × 7,061.98
  4. Step 4: Simplify right side
    18,916.90x = 200,255,013.22
  5. Step 5: Solve for x
    x = 200,255,013.22/18,916.90
  6. Step 6: Final answer
    x = 10,586.04

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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.