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Finding the Fourth Proportional to 80,574.80, 120,716.40 and 65,703.20

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Solution

The fourth proportional to 80,574.80, 120,716.40 and 65,703.20 is: 98,435.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,574.80 : 120,716.40 = 65,703.20 : x
  2. Step 2: Convert to fraction form
    80,574.80/120,716.40 = 65,703.20/x
  3. Step 3: Cross multiply
    80,574.80x = 120,716.40 × 65,703.20
  4. Step 4: Simplify right side
    80,574.80x = 7,931,453,772.48
  5. Step 5: Solve for x
    x = 7,931,453,772.48/80,574.80
  6. Step 6: Final answer
    x = 98,435.91

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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.