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Finding the Fourth Proportional to 91,380.80, 137,022.60 and 38,730.80

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Solution

The fourth proportional to 91,380.80, 137,022.60 and 38,730.80 is: 58,075.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,380.80 : 137,022.60 = 38,730.80 : x
  2. Step 2: Convert to fraction form
    91,380.80/137,022.60 = 38,730.80/x
  3. Step 3: Cross multiply
    91,380.80x = 137,022.60 × 38,730.80
  4. Step 4: Simplify right side
    91,380.80x = 5,306,994,916.08
  5. Step 5: Solve for x
    x = 5,306,994,916.08/91,380.80
  6. Step 6: Final answer
    x = 58,075.60

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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.