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Finding the Fourth Proportional to 61,540.40, 92,310.60 and 19,987.40

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Solution

The fourth proportional to 61,540.40, 92,310.60 and 19,987.40 is: 29,981.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,540.40 : 92,310.60 = 19,987.40 : x
  2. Step 2: Convert to fraction form
    61,540.40/92,310.60 = 19,987.40/x
  3. Step 3: Cross multiply
    61,540.40x = 92,310.60 × 19,987.40
  4. Step 4: Simplify right side
    61,540.40x = 1,845,048,886.44
  5. Step 5: Solve for x
    x = 1,845,048,886.44/61,540.40
  6. Step 6: Final answer
    x = 29,981.10

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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.