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Finding the Fourth Proportional to 43,390.80, 65,089.80 and 13,807.80

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Solution

The fourth proportional to 43,390.80, 65,089.80 and 13,807.80 is: 20,712.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,390.80 : 65,089.80 = 13,807.80 : x
  2. Step 2: Convert to fraction form
    43,390.80/65,089.80 = 13,807.80/x
  3. Step 3: Cross multiply
    43,390.80x = 65,089.80 × 13,807.80
  4. Step 4: Simplify right side
    43,390.80x = 898,746,940.44
  5. Step 5: Solve for x
    x = 898,746,940.44/43,390.80
  6. Step 6: Final answer
    x = 20,712.85

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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.