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Finding the Fourth Proportional to 80,477.91, 120,835.36 and 45,008.72

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Solution

The fourth proportional to 80,477.91, 120,835.36 and 45,008.72 is: 67,579.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,477.91 : 120,835.36 = 45,008.72 : x
  2. Step 2: Convert to fraction form
    80,477.91/120,835.36 = 45,008.72/x
  3. Step 3: Cross multiply
    80,477.91x = 120,835.36 × 45,008.72
  4. Step 4: Simplify right side
    80,477.91x = 5,438,644,409.11
  5. Step 5: Solve for x
    x = 5,438,644,409.11/80,477.91
  6. Step 6: Final answer
    x = 67,579.35

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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.