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Finding the Fourth Proportional to 13,688.08, 18,889.08 and 7,719.92

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Solution

The fourth proportional to 13,688.08, 18,889.08 and 7,719.92 is: 10,653.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.08 : 18,889.08 = 7,719.92 : x
  2. Step 2: Convert to fraction form
    13,688.08/18,889.08 = 7,719.92/x
  3. Step 3: Cross multiply
    13,688.08x = 18,889.08 × 7,719.92
  4. Step 4: Simplify right side
    13,688.08x = 145,822,186.47
  5. Step 5: Solve for x
    x = 145,822,186.47/13,688.08
  6. Step 6: Final answer
    x = 10,653.22

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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.