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Finding the Fourth Proportional to 120,402.08, 180,714 and 61,280

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Solution

The fourth proportional to 120,402.08, 180,714 and 61,280 is: 91,976.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,402.08 : 180,714 = 61,280 : x
  2. Step 2: Convert to fraction form
    120,402.08/180,714 = 61,280/x
  3. Step 3: Cross multiply
    120,402.08x = 180,714 × 61,280
  4. Step 4: Simplify right side
    120,402.08x = 11,074,153,920
  5. Step 5: Solve for x
    x = 11,074,153,920/120,402.08
  6. Step 6: Final answer
    x = 91,976.43

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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.