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Finding the Fourth Proportional to 100,681.64, 138,941.18 and 55,362.56

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Solution

The fourth proportional to 100,681.64, 138,941.18 and 55,362.56 is: 76,400.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,681.64 : 138,941.18 = 55,362.56 : x
  2. Step 2: Convert to fraction form
    100,681.64/138,941.18 = 55,362.56/x
  3. Step 3: Cross multiply
    100,681.64x = 138,941.18 × 55,362.56
  4. Step 4: Simplify right side
    100,681.64x = 7,692,139,743.27
  5. Step 5: Solve for x
    x = 7,692,139,743.27/100,681.64
  6. Step 6: Final answer
    x = 76,400.62

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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.