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Finding the Fourth Proportional to 141,911.80, 212,626.81 and 85,633.66

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Solution

The fourth proportional to 141,911.80, 212,626.81 and 85,633.66 is: 128,305.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,911.80 : 212,626.81 = 85,633.66 : x
  2. Step 2: Convert to fraction form
    141,911.80/212,626.81 = 85,633.66/x
  3. Step 3: Cross multiply
    141,911.80x = 212,626.81 × 85,633.66
  4. Step 4: Simplify right side
    141,911.80x = 18,208,011,208.77
  5. Step 5: Solve for x
    x = 18,208,011,208.77/141,911.80
  6. Step 6: Final answer
    x = 128,305.13

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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.