Home / 13,420.06-18,515.11-7,831.06

Finding the Fourth Proportional to 13,420.06, 18,515.11 and 7,831.06

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Solution

The fourth proportional to 13,420.06, 18,515.11 and 7,831.06 is: 10,804.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.06 : 18,515.11 = 7,831.06 : x
  2. Step 2: Convert to fraction form
    13,420.06/18,515.11 = 7,831.06/x
  3. Step 3: Cross multiply
    13,420.06x = 18,515.11 × 7,831.06
  4. Step 4: Simplify right side
    13,420.06x = 144,992,937.32
  5. Step 5: Solve for x
    x = 144,992,937.32/13,420.06
  6. Step 6: Final answer
    x = 10,804.19

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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.