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Finding the Fourth Proportional to 80,643.60, 120,965.40 and 43,318.80

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Solution

The fourth proportional to 80,643.60, 120,965.40 and 43,318.80 is: 64,978.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,643.60 : 120,965.40 = 43,318.80 : x
  2. Step 2: Convert to fraction form
    80,643.60/120,965.40 = 43,318.80/x
  3. Step 3: Cross multiply
    80,643.60x = 120,965.40 × 43,318.80
  4. Step 4: Simplify right side
    80,643.60x = 5,240,075,969.52
  5. Step 5: Solve for x
    x = 5,240,075,969.52/80,643.60
  6. Step 6: Final answer
    x = 64,978.20

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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.