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Finding the Fourth Proportional to 91,457.94, 137,872.38 and 85,361.67

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Solution

The fourth proportional to 91,457.94, 137,872.38 and 85,361.67 is: 128,682.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,457.94 : 137,872.38 = 85,361.67 : x
  2. Step 2: Convert to fraction form
    91,457.94/137,872.38 = 85,361.67/x
  3. Step 3: Cross multiply
    91,457.94x = 137,872.38 × 85,361.67
  4. Step 4: Simplify right side
    91,457.94x = 11,769,016,603.67
  5. Step 5: Solve for x
    x = 11,769,016,603.67/91,457.94
  6. Step 6: Final answer
    x = 128,682.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.