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Finding the Fourth Proportional to 43,808.40, 65,719.80 and 18,860.40

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Solution

The fourth proportional to 43,808.40, 65,719.80 and 18,860.40 is: 28,293.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,808.40 : 65,719.80 = 18,860.40 : x
  2. Step 2: Convert to fraction form
    43,808.40/65,719.80 = 18,860.40/x
  3. Step 3: Cross multiply
    43,808.40x = 65,719.80 × 18,860.40
  4. Step 4: Simplify right side
    43,808.40x = 1,239,501,715.92
  5. Step 5: Solve for x
    x = 1,239,501,715.92/43,808.40
  6. Step 6: Final answer
    x = 28,293.70

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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.