Home / 13,688.07-18,890.06-7,719.39

Finding the Fourth Proportional to 13,688.07, 18,890.06 and 7,719.39

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Solution

The fourth proportional to 13,688.07, 18,890.06 and 7,719.39 is: 10,653.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.07 : 18,890.06 = 7,719.39 : x
  2. Step 2: Convert to fraction form
    13,688.07/18,890.06 = 7,719.39/x
  3. Step 3: Cross multiply
    13,688.07x = 18,890.06 × 7,719.39
  4. Step 4: Simplify right side
    13,688.07x = 145,819,701.67
  5. Step 5: Solve for x
    x = 145,819,701.67/13,688.07
  6. Step 6: Final answer
    x = 10,653.05

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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.