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Finding the Fourth Proportional to 40,689.60, 61,034.40 and 34,128.60

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Solution

The fourth proportional to 40,689.60, 61,034.40 and 34,128.60 is: 51,192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,689.60 : 61,034.40 = 34,128.60 : x
  2. Step 2: Convert to fraction form
    40,689.60/61,034.40 = 34,128.60/x
  3. Step 3: Cross multiply
    40,689.60x = 61,034.40 × 34,128.60
  4. Step 4: Simplify right side
    40,689.60x = 2,083,018,623.84
  5. Step 5: Solve for x
    x = 2,083,018,623.84/40,689.60
  6. Step 6: Final answer
    x = 51,192.90

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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.