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Finding the Fourth Proportional to 40,878.60, 61,317.90 and 13,176.60

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Solution

The fourth proportional to 40,878.60, 61,317.90 and 13,176.60 is: 19,764.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,878.60 : 61,317.90 = 13,176.60 : x
  2. Step 2: Convert to fraction form
    40,878.60/61,317.90 = 13,176.60/x
  3. Step 3: Cross multiply
    40,878.60x = 61,317.90 × 13,176.60
  4. Step 4: Simplify right side
    40,878.60x = 807,961,441.14
  5. Step 5: Solve for x
    x = 807,961,441.14/40,878.60
  6. Step 6: Final answer
    x = 19,764.90

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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.