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Finding the Fourth Proportional to 13,671.09, 18,866.15 and 7,929.68

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Solution

The fourth proportional to 13,671.09, 18,866.15 and 7,929.68 is: 10,942.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,671.09 : 18,866.15 = 7,929.68 : x
  2. Step 2: Convert to fraction form
    13,671.09/18,866.15 = 7,929.68/x
  3. Step 3: Cross multiply
    13,671.09x = 18,866.15 × 7,929.68
  4. Step 4: Simplify right side
    13,671.09x = 149,602,457.83
  5. Step 5: Solve for x
    x = 149,602,457.83/13,671.09
  6. Step 6: Final answer
    x = 10,942.98

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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.