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Finding the Fourth Proportional to 61,438.60, 91,985.10 and 55,217.80

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Solution

The fourth proportional to 61,438.60, 91,985.10 and 55,217.80 is: 82,671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,438.60 : 91,985.10 = 55,217.80 : x
  2. Step 2: Convert to fraction form
    61,438.60/91,985.10 = 55,217.80/x
  3. Step 3: Cross multiply
    61,438.60x = 91,985.10 × 55,217.80
  4. Step 4: Simplify right side
    61,438.60x = 5,079,214,854.78
  5. Step 5: Solve for x
    x = 5,079,214,854.78/61,438.60
  6. Step 6: Final answer
    x = 82,671.40

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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.