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Finding the Fourth Proportional to 91,203.13, 137,012.28 and 65,980.44

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Solution

The fourth proportional to 91,203.13, 137,012.28 and 65,980.44 is: 99,120.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,203.13 : 137,012.28 = 65,980.44 : x
  2. Step 2: Convert to fraction form
    91,203.13/137,012.28 = 65,980.44/x
  3. Step 3: Cross multiply
    91,203.13x = 137,012.28 × 65,980.44
  4. Step 4: Simplify right side
    91,203.13x = 9,040,130,519.80
  5. Step 5: Solve for x
    x = 9,040,130,519.80/91,203.13
  6. Step 6: Final answer
    x = 99,120.84

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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.