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Finding the Fourth Proportional to 14,792.70, 20,412.09 and 8,420.12

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Solution

The fourth proportional to 14,792.70, 20,412.09 and 8,420.12 is: 11,618.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,792.70 : 20,412.09 = 8,420.12 : x
  2. Step 2: Convert to fraction form
    14,792.70/20,412.09 = 8,420.12/x
  3. Step 3: Cross multiply
    14,792.70x = 20,412.09 × 8,420.12
  4. Step 4: Simplify right side
    14,792.70x = 171,872,145.19
  5. Step 5: Solve for x
    x = 171,872,145.19/14,792.70
  6. Step 6: Final answer
    x = 11,618.71

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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.