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Finding the Fourth Proportional to 14,709.78, 20,299.95 and 8,424.18

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Solution

The fourth proportional to 14,709.78, 20,299.95 and 8,424.18 is: 11,625.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,709.78 : 20,299.95 = 8,424.18 : x
  2. Step 2: Convert to fraction form
    14,709.78/20,299.95 = 8,424.18/x
  3. Step 3: Cross multiply
    14,709.78x = 20,299.95 × 8,424.18
  4. Step 4: Simplify right side
    14,709.78x = 171,010,432.79
  5. Step 5: Solve for x
    x = 171,010,432.79/14,709.78
  6. Step 6: Final answer
    x = 11,625.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.