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Finding the Fourth Proportional to 92,885.40, 139,619.70 and 91,135.80

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Solution

The fourth proportional to 92,885.40, 139,619.70 and 91,135.80 is: 136,989.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,885.40 : 139,619.70 = 91,135.80 : x
  2. Step 2: Convert to fraction form
    92,885.40/139,619.70 = 91,135.80/x
  3. Step 3: Cross multiply
    92,885.40x = 139,619.70 × 91,135.80
  4. Step 4: Simplify right side
    92,885.40x = 12,724,353,055.26
  5. Step 5: Solve for x
    x = 12,724,353,055.26/92,885.40
  6. Step 6: Final answer
    x = 136,989.81

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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.