Home / 13,688.06-18,889.40-7,720.79

Finding the Fourth Proportional to 13,688.06, 18,889.40 and 7,720.79

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Solution

The fourth proportional to 13,688.06, 18,889.40 and 7,720.79 is: 10,654.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.06 : 18,889.40 = 7,720.79 : x
  2. Step 2: Convert to fraction form
    13,688.06/18,889.40 = 7,720.79/x
  3. Step 3: Cross multiply
    13,688.06x = 18,889.40 × 7,720.79
  4. Step 4: Simplify right side
    13,688.06x = 145,841,015.48
  5. Step 5: Solve for x
    x = 145,841,015.48/13,688.06
  6. Step 6: Final answer
    x = 10,654.62

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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.