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Finding the Fourth Proportional to 189,265.70, 261,120.70 and 121,320.14

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Solution

The fourth proportional to 189,265.70, 261,120.70 and 121,320.14 is: 167,379.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,265.70 : 261,120.70 = 121,320.14 : x
  2. Step 2: Convert to fraction form
    189,265.70/261,120.70 = 121,320.14/x
  3. Step 3: Cross multiply
    189,265.70x = 261,120.70 × 121,320.14
  4. Step 4: Simplify right side
    189,265.70x = 31,679,199,880.90
  5. Step 5: Solve for x
    x = 31,679,199,880.90/189,265.70
  6. Step 6: Final answer
    x = 167,379.51

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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.