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Finding the Fourth Proportional to 43,808.64, 65,715.12 and 12,218.64

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Solution

The fourth proportional to 43,808.64, 65,715.12 and 12,218.64 is: 18,328.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,808.64 : 65,715.12 = 12,218.64 : x
  2. Step 2: Convert to fraction form
    43,808.64/65,715.12 = 12,218.64/x
  3. Step 3: Cross multiply
    43,808.64x = 65,715.12 × 12,218.64
  4. Step 4: Simplify right side
    43,808.64x = 802,949,393.84
  5. Step 5: Solve for x
    x = 802,949,393.84/43,808.64
  6. Step 6: Final answer
    x = 18,328.56

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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.