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Finding the Fourth Proportional to 92,685.80, 139,028.70 and 57,693.80

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Solution

The fourth proportional to 92,685.80, 139,028.70 and 57,693.80 is: 86,540.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,685.80 : 139,028.70 = 57,693.80 : x
  2. Step 2: Convert to fraction form
    92,685.80/139,028.70 = 57,693.80/x
  3. Step 3: Cross multiply
    92,685.80x = 139,028.70 × 57,693.80
  4. Step 4: Simplify right side
    92,685.80x = 8,021,094,012.06
  5. Step 5: Solve for x
    x = 8,021,094,012.06/92,685.80
  6. Step 6: Final answer
    x = 86,540.70

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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.