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Finding the Fourth Proportional to 80,603.20, 120,904.80 and 61,919.20

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Solution

The fourth proportional to 80,603.20, 120,904.80 and 61,919.20 is: 92,878.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,603.20 : 120,904.80 = 61,919.20 : x
  2. Step 2: Convert to fraction form
    80,603.20/120,904.80 = 61,919.20/x
  3. Step 3: Cross multiply
    80,603.20x = 120,904.80 × 61,919.20
  4. Step 4: Simplify right side
    80,603.20x = 7,486,328,492.16
  5. Step 5: Solve for x
    x = 7,486,328,492.16/80,603.20
  6. Step 6: Final answer
    x = 92,878.80

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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.