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Finding the Fourth Proportional to 120,003.70, 180,005.55 and 86,955.70

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Solution

The fourth proportional to 120,003.70, 180,005.55 and 86,955.70 is: 130,433.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,003.70 : 180,005.55 = 86,955.70 : x
  2. Step 2: Convert to fraction form
    120,003.70/180,005.55 = 86,955.70/x
  3. Step 3: Cross multiply
    120,003.70x = 180,005.55 × 86,955.70
  4. Step 4: Simplify right side
    120,003.70x = 15,652,508,604.14
  5. Step 5: Solve for x
    x = 15,652,508,604.14/120,003.70
  6. Step 6: Final answer
    x = 130,433.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.