Home / 13,389.87-18,457.56-9,399.81

Finding the Fourth Proportional to 13,389.87, 18,457.56 and 9,399.81

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Solution

The fourth proportional to 13,389.87, 18,457.56 and 9,399.81 is: 12,957.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.87 : 18,457.56 = 9,399.81 : x
  2. Step 2: Convert to fraction form
    13,389.87/18,457.56 = 9,399.81/x
  3. Step 3: Cross multiply
    13,389.87x = 18,457.56 × 9,399.81
  4. Step 4: Simplify right side
    13,389.87x = 173,497,557.06
  5. Step 5: Solve for x
    x = 173,497,557.06/13,389.87
  6. Step 6: Final answer
    x = 12,957.37

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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.