Home / 120,123.20-165,770.40-66,411.20

Finding the Fourth Proportional to 120,123.20, 165,770.40 and 66,411.20

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Solution

The fourth proportional to 120,123.20, 165,770.40 and 66,411.20 is: 91,647.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,123.20 : 165,770.40 = 66,411.20 : x
  2. Step 2: Convert to fraction form
    120,123.20/165,770.40 = 66,411.20/x
  3. Step 3: Cross multiply
    120,123.20x = 165,770.40 × 66,411.20
  4. Step 4: Simplify right side
    120,123.20x = 11,009,011,188.48
  5. Step 5: Solve for x
    x = 11,009,011,188.48/120,123.20
  6. Step 6: Final answer
    x = 91,647.67

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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.