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Finding the Fourth Proportional to 80,606.90, 120,911.51 and 30,689.74

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Solution

The fourth proportional to 80,606.90, 120,911.51 and 30,689.74 is: 46,035.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,606.90 : 120,911.51 = 30,689.74 : x
  2. Step 2: Convert to fraction form
    80,606.90/120,911.51 = 30,689.74/x
  3. Step 3: Cross multiply
    80,606.90x = 120,911.51 × 30,689.74
  4. Step 4: Simplify right side
    80,606.90x = 3,710,742,776.42
  5. Step 5: Solve for x
    x = 3,710,742,776.42/80,606.90
  6. Step 6: Final answer
    x = 46,035.05

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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.