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Finding the Fourth Proportional to 120,134.88, 165,820.75 and 79,328.81

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Solution

The fourth proportional to 120,134.88, 165,820.75 and 79,328.81 is: 109,496.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,134.88 : 165,820.75 = 79,328.81 : x
  2. Step 2: Convert to fraction form
    120,134.88/165,820.75 = 79,328.81/x
  3. Step 3: Cross multiply
    120,134.88x = 165,820.75 × 79,328.81
  4. Step 4: Simplify right side
    120,134.88x = 13,154,362,987.04
  5. Step 5: Solve for x
    x = 13,154,362,987.04/120,134.88
  6. Step 6: Final answer
    x = 109,496.62

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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.