Home / 13,505.31-18,660.17-9,720.99

Finding the Fourth Proportional to 13,505.31, 18,660.17 and 9,720.99

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Solution

The fourth proportional to 13,505.31, 18,660.17 and 9,720.99 is: 13,431.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,505.31 : 18,660.17 = 9,720.99 : x
  2. Step 2: Convert to fraction form
    13,505.31/18,660.17 = 9,720.99/x
  3. Step 3: Cross multiply
    13,505.31x = 18,660.17 × 9,720.99
  4. Step 4: Simplify right side
    13,505.31x = 181,395,277.36
  5. Step 5: Solve for x
    x = 181,395,277.36/13,505.31
  6. Step 6: Final answer
    x = 13,431.40

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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.