Home / 13,688.11-18,889.54-7,719.74

Finding the Fourth Proportional to 13,688.11, 18,889.54 and 7,719.74

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Solution

The fourth proportional to 13,688.11, 18,889.54 and 7,719.74 is: 10,653.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.11 : 18,889.54 = 7,719.74 : x
  2. Step 2: Convert to fraction form
    13,688.11/18,889.54 = 7,719.74/x
  3. Step 3: Cross multiply
    13,688.11x = 18,889.54 × 7,719.74
  4. Step 4: Simplify right side
    13,688.11x = 145,822,294.61
  5. Step 5: Solve for x
    x = 145,822,294.61/13,688.11
  6. Step 6: Final answer
    x = 10,653.21

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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.