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Finding the Fourth Proportional to 21,471.64, 29,624.15 and 12,395.81

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Solution

The fourth proportional to 21,471.64, 29,624.15 and 12,395.81 is: 17,102.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,471.64 : 29,624.15 = 12,395.81 : x
  2. Step 2: Convert to fraction form
    21,471.64/29,624.15 = 12,395.81/x
  3. Step 3: Cross multiply
    21,471.64x = 29,624.15 × 12,395.81
  4. Step 4: Simplify right side
    21,471.64x = 367,215,439.86
  5. Step 5: Solve for x
    x = 367,215,439.86/21,471.64
  6. Step 6: Final answer
    x = 17,102.35

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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.