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Finding the Fourth Proportional to 120,090.42, 165,714.80 and 66,375.45

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Solution

The fourth proportional to 120,090.42, 165,714.80 and 66,375.45 is: 91,592.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,090.42 : 165,714.80 = 66,375.45 : x
  2. Step 2: Convert to fraction form
    120,090.42/165,714.80 = 66,375.45/x
  3. Step 3: Cross multiply
    120,090.42x = 165,714.80 × 66,375.45
  4. Step 4: Simplify right side
    120,090.42x = 10,999,394,089.78
  5. Step 5: Solve for x
    x = 10,999,394,089.78/120,090.42
  6. Step 6: Final answer
    x = 91,592.60

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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.