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Finding the Fourth Proportional to 92,685.60, 139,028.40 and 55,287.90

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Solution

The fourth proportional to 92,685.60, 139,028.40 and 55,287.90 is: 82,931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,685.60 : 139,028.40 = 55,287.90 : x
  2. Step 2: Convert to fraction form
    92,685.60/139,028.40 = 55,287.90/x
  3. Step 3: Cross multiply
    92,685.60x = 139,028.40 × 55,287.90
  4. Step 4: Simplify right side
    92,685.60x = 7,686,588,276.36
  5. Step 5: Solve for x
    x = 7,686,588,276.36/92,685.60
  6. Step 6: Final answer
    x = 82,931.85

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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.