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Finding the Fourth Proportional to 12,420.24, 17,139.48 and 6,831.12

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Solution

The fourth proportional to 12,420.24, 17,139.48 and 6,831.12 is: 9,426.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.24 : 17,139.48 = 6,831.12 : x
  2. Step 2: Convert to fraction form
    12,420.24/17,139.48 = 6,831.12/x
  3. Step 3: Cross multiply
    12,420.24x = 17,139.48 × 6,831.12
  4. Step 4: Simplify right side
    12,420.24x = 117,081,844.62
  5. Step 5: Solve for x
    x = 117,081,844.62/12,420.24
  6. Step 6: Final answer
    x = 9,426.70

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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.