Home / 12,389.81-17,112.13-8,159.78

Finding the Fourth Proportional to 12,389.81, 17,112.13 and 8,159.78

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Solution

The fourth proportional to 12,389.81, 17,112.13 and 8,159.78 is: 11,269.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,389.81 : 17,112.13 = 8,159.78 : x
  2. Step 2: Convert to fraction form
    12,389.81/17,112.13 = 8,159.78/x
  3. Step 3: Cross multiply
    12,389.81x = 17,112.13 × 8,159.78
  4. Step 4: Simplify right side
    12,389.81x = 139,631,238.51
  5. Step 5: Solve for x
    x = 139,631,238.51/12,389.81
  6. Step 6: Final answer
    x = 11,269.85

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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.