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Finding the Fourth Proportional to 69,085.90, 103,689.60 and 40,970.80

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Solution

The fourth proportional to 69,085.90, 103,689.60 and 40,970.80 is: 61,492.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,085.90 : 103,689.60 = 40,970.80 : x
  2. Step 2: Convert to fraction form
    69,085.90/103,689.60 = 40,970.80/x
  3. Step 3: Cross multiply
    69,085.90x = 103,689.60 × 40,970.80
  4. Step 4: Simplify right side
    69,085.90x = 4,248,245,863.68
  5. Step 5: Solve for x
    x = 4,248,245,863.68/69,085.90
  6. Step 6: Final answer
    x = 61,492.23

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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.