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Finding the Fourth Proportional to 14,798.72, 20,420.28 and 8,831.12

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Solution

The fourth proportional to 14,798.72, 20,420.28 and 8,831.12 is: 12,185.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,798.72 : 20,420.28 = 8,831.12 : x
  2. Step 2: Convert to fraction form
    14,798.72/20,420.28 = 8,831.12/x
  3. Step 3: Cross multiply
    14,798.72x = 20,420.28 × 8,831.12
  4. Step 4: Simplify right side
    14,798.72x = 180,333,943.11
  5. Step 5: Solve for x
    x = 180,333,943.11/14,798.72
  6. Step 6: Final answer
    x = 12,185.78

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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.