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Finding the Fourth Proportional to 76,811.10, 115,289.55 and 65,730.30

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Solution

The fourth proportional to 76,811.10, 115,289.55 and 65,730.30 is: 98,657.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,811.10 : 115,289.55 = 65,730.30 : x
  2. Step 2: Convert to fraction form
    76,811.10/115,289.55 = 65,730.30/x
  3. Step 3: Cross multiply
    76,811.10x = 115,289.55 × 65,730.30
  4. Step 4: Simplify right side
    76,811.10x = 7,578,016,708.37
  5. Step 5: Solve for x
    x = 7,578,016,708.37/76,811.10
  6. Step 6: Final answer
    x = 98,657.83

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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.