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Finding the Fourth Proportional to 100,656.60, 138,907.80 and 55,336.47

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Solution

The fourth proportional to 100,656.60, 138,907.80 and 55,336.47 is: 76,365.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,656.60 : 138,907.80 = 55,336.47 : x
  2. Step 2: Convert to fraction form
    100,656.60/138,907.80 = 55,336.47/x
  3. Step 3: Cross multiply
    100,656.60x = 138,907.80 × 55,336.47
  4. Step 4: Simplify right side
    100,656.60x = 7,686,667,307.47
  5. Step 5: Solve for x
    x = 7,686,667,307.47/100,656.60
  6. Step 6: Final answer
    x = 76,365.26

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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.