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Finding the Fourth Proportional to 91,320.90, 137,002.95 and 28,991.40

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Solution

The fourth proportional to 91,320.90, 137,002.95 and 28,991.40 is: 43,493.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,320.90 : 137,002.95 = 28,991.40 : x
  2. Step 2: Convert to fraction form
    91,320.90/137,002.95 = 28,991.40/x
  3. Step 3: Cross multiply
    91,320.90x = 137,002.95 × 28,991.40
  4. Step 4: Simplify right side
    91,320.90x = 3,971,907,324.63
  5. Step 5: Solve for x
    x = 3,971,907,324.63/91,320.90
  6. Step 6: Final answer
    x = 43,493.96

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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.