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Finding the Fourth Proportional to 12,420.50, 17,140.28 and 6,831.50

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Solution

The fourth proportional to 12,420.50, 17,140.28 and 6,831.50 is: 9,427.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.50 : 17,140.28 = 6,831.50 : x
  2. Step 2: Convert to fraction form
    12,420.50/17,140.28 = 6,831.50/x
  3. Step 3: Cross multiply
    12,420.50x = 17,140.28 × 6,831.50
  4. Step 4: Simplify right side
    12,420.50x = 117,093,754.20
  5. Step 5: Solve for x
    x = 117,093,754.20/12,420.50
  6. Step 6: Final answer
    x = 9,427.46

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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.