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Finding the Fourth Proportional to 13,386.66, 18,474.27 and 7,719.30

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Solution

The fourth proportional to 13,386.66, 18,474.27 and 7,719.30 is: 10,653.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,386.66 : 18,474.27 = 7,719.30 : x
  2. Step 2: Convert to fraction form
    13,386.66/18,474.27 = 7,719.30/x
  3. Step 3: Cross multiply
    13,386.66x = 18,474.27 × 7,719.30
  4. Step 4: Simplify right side
    13,386.66x = 142,608,432.41
  5. Step 5: Solve for x
    x = 142,608,432.41/13,386.66
  6. Step 6: Final answer
    x = 10,653.03

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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.