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Finding the Fourth Proportional to 12,561.40, 18,831.30 and 6,405.40

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Solution

The fourth proportional to 12,561.40, 18,831.30 and 6,405.40 is: 9,602.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,561.40 : 18,831.30 = 6,405.40 : x
  2. Step 2: Convert to fraction form
    12,561.40/18,831.30 = 6,405.40/x
  3. Step 3: Cross multiply
    12,561.40x = 18,831.30 × 6,405.40
  4. Step 4: Simplify right side
    12,561.40x = 120,622,009.02
  5. Step 5: Solve for x
    x = 120,622,009.02/12,561.40
  6. Step 6: Final answer
    x = 9,602.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.