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Finding the Fourth Proportional to 120,161.70, 165,821.40 and 66,445.53

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Solution

The fourth proportional to 120,161.70, 165,821.40 and 66,445.53 is: 91,693.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,161.70 : 165,821.40 = 66,445.53 : x
  2. Step 2: Convert to fraction form
    120,161.70/165,821.40 = 66,445.53/x
  3. Step 3: Cross multiply
    120,161.70x = 165,821.40 × 66,445.53
  4. Step 4: Simplify right side
    120,161.70x = 11,018,090,808.34
  5. Step 5: Solve for x
    x = 11,018,090,808.34/120,161.70
  6. Step 6: Final answer
    x = 91,693.87

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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.