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Finding the Fourth Proportional to 13,580.60, 18,740.79 and 7,612.61

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Solution

The fourth proportional to 13,580.60, 18,740.79 and 7,612.61 is: 10,505.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,580.60 : 18,740.79 = 7,612.61 : x
  2. Step 2: Convert to fraction form
    13,580.60/18,740.79 = 7,612.61/x
  3. Step 3: Cross multiply
    13,580.60x = 18,740.79 × 7,612.61
  4. Step 4: Simplify right side
    13,580.60x = 142,666,231.66
  5. Step 5: Solve for x
    x = 142,666,231.66/13,580.60
  6. Step 6: Final answer
    x = 10,505.15

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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.