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Finding the Fourth Proportional to 76,963.20, 115,444.80 and 72,662.40

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Solution

The fourth proportional to 76,963.20, 115,444.80 and 72,662.40 is: 108,993.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,963.20 : 115,444.80 = 72,662.40 : x
  2. Step 2: Convert to fraction form
    76,963.20/115,444.80 = 72,662.40/x
  3. Step 3: Cross multiply
    76,963.20x = 115,444.80 × 72,662.40
  4. Step 4: Simplify right side
    76,963.20x = 8,388,496,235.52
  5. Step 5: Solve for x
    x = 8,388,496,235.52/76,963.20
  6. Step 6: Final answer
    x = 108,993.60

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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.