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Finding the Fourth Proportional to 61,455.88, 84,821.30 and 39,915.56

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Solution

The fourth proportional to 61,455.88, 84,821.30 and 39,915.56 is: 55,091.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,455.88 : 84,821.30 = 39,915.56 : x
  2. Step 2: Convert to fraction form
    61,455.88/84,821.30 = 39,915.56/x
  3. Step 3: Cross multiply
    61,455.88x = 84,821.30 × 39,915.56
  4. Step 4: Simplify right side
    61,455.88x = 3,385,689,689.43
  5. Step 5: Solve for x
    x = 3,385,689,689.43/61,455.88
  6. Step 6: Final answer
    x = 55,091.39

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1.5x scale

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.