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Finding the Fourth Proportional to 100,689.37, 138,948.38 and 55,367.30

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Solution

The fourth proportional to 100,689.37, 138,948.38 and 55,367.30 is: 76,405.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,689.37 : 138,948.38 = 55,367.30 : x
  2. Step 2: Convert to fraction form
    100,689.37/138,948.38 = 55,367.30/x
  3. Step 3: Cross multiply
    100,689.37x = 138,948.38 × 55,367.30
  4. Step 4: Simplify right side
    100,689.37x = 7,693,197,125.76
  5. Step 5: Solve for x
    x = 7,693,197,125.76/100,689.37
  6. Step 6: Final answer
    x = 76,405.26

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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.