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Finding the Fourth Proportional to 120,130.80, 165,778.02 and 66,418.08

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Solution

The fourth proportional to 120,130.80, 165,778.02 and 66,418.08 is: 91,655.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,130.80 : 165,778.02 = 66,418.08 : x
  2. Step 2: Convert to fraction form
    120,130.80/165,778.02 = 66,418.08/x
  3. Step 3: Cross multiply
    120,130.80x = 165,778.02 × 66,418.08
  4. Step 4: Simplify right side
    120,130.80x = 11,010,657,794.60
  5. Step 5: Solve for x
    x = 11,010,657,794.60/120,130.80
  6. Step 6: Final answer
    x = 91,655.58

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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.