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Finding the Fourth Proportional to 104,391.60, 143,994.72 and 61,920

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Solution

The fourth proportional to 104,391.60, 143,994.72 and 61,920 is: 85,410.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,391.60 : 143,994.72 = 61,920 : x
  2. Step 2: Convert to fraction form
    104,391.60/143,994.72 = 61,920/x
  3. Step 3: Cross multiply
    104,391.60x = 143,994.72 × 61,920
  4. Step 4: Simplify right side
    104,391.60x = 8,916,153,062.40
  5. Step 5: Solve for x
    x = 8,916,153,062.40/104,391.60
  6. Step 6: Final answer
    x = 85,410.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.