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Finding the Fourth Proportional to 18,831.26, 28,252.16 and 7,145.40

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Solution

The fourth proportional to 18,831.26, 28,252.16 and 7,145.40 is: 10,720.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,831.26 : 28,252.16 = 7,145.40 : x
  2. Step 2: Convert to fraction form
    18,831.26/28,252.16 = 7,145.40/x
  3. Step 3: Cross multiply
    18,831.26x = 28,252.16 × 7,145.40
  4. Step 4: Simplify right side
    18,831.26x = 201,872,984.06
  5. Step 5: Solve for x
    x = 201,872,984.06/18,831.26
  6. Step 6: Final answer
    x = 10,720.10

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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.