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Finding the Fourth Proportional to 91,920.21, 137,880.42 and 28,740.67

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Solution

The fourth proportional to 91,920.21, 137,880.42 and 28,740.67 is: 43,111.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,920.21 : 137,880.42 = 28,740.67 : x
  2. Step 2: Convert to fraction form
    91,920.21/137,880.42 = 28,740.67/x
  3. Step 3: Cross multiply
    91,920.21x = 137,880.42 × 28,740.67
  4. Step 4: Simplify right side
    91,920.21x = 3,962,775,650.68
  5. Step 5: Solve for x
    x = 3,962,775,650.68/91,920.21
  6. Step 6: Final answer
    x = 43,111.04

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1.5x scale

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.