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Finding the Fourth Proportional to 100,605.06, 138,837.29 and 55,280.21

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Solution

The fourth proportional to 100,605.06, 138,837.29 and 55,280.21 is: 76,287.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,605.06 : 138,837.29 = 55,280.21 : x
  2. Step 2: Convert to fraction form
    100,605.06/138,837.29 = 55,280.21/x
  3. Step 3: Cross multiply
    100,605.06x = 138,837.29 × 55,280.21
  4. Step 4: Simplify right side
    100,605.06x = 7,674,953,576.44
  5. Step 5: Solve for x
    x = 7,674,953,576.44/100,605.06
  6. Step 6: Final answer
    x = 76,287.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.