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Finding the Fourth Proportional to 76,143.95, 114,215.91 and 20,739.95

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Solution

The fourth proportional to 76,143.95, 114,215.91 and 20,739.95 is: 31,109.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,143.95 : 114,215.91 = 20,739.95 : x
  2. Step 2: Convert to fraction form
    76,143.95/114,215.91 = 20,739.95/x
  3. Step 3: Cross multiply
    76,143.95x = 114,215.91 × 20,739.95
  4. Step 4: Simplify right side
    76,143.95x = 2,368,831,691.52
  5. Step 5: Solve for x
    x = 2,368,831,691.52/76,143.95
  6. Step 6: Final answer
    x = 31,109.92

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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.