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Finding the Fourth Proportional to 91,875.80, 137,813.70 and 80,211.80

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Solution

The fourth proportional to 91,875.80, 137,813.70 and 80,211.80 is: 120,317.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,875.80 : 137,813.70 = 80,211.80 : x
  2. Step 2: Convert to fraction form
    91,875.80/137,813.70 = 80,211.80/x
  3. Step 3: Cross multiply
    91,875.80x = 137,813.70 × 80,211.80
  4. Step 4: Simplify right side
    91,875.80x = 11,054,284,941.66
  5. Step 5: Solve for x
    x = 11,054,284,941.66/91,875.80
  6. Step 6: Final answer
    x = 120,317.70

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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.