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Finding the Fourth Proportional to 145,847.70, 218,771.55 and 85,814.55

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Solution

The fourth proportional to 145,847.70, 218,771.55 and 85,814.55 is: 128,721.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,847.70 : 218,771.55 = 85,814.55 : x
  2. Step 2: Convert to fraction form
    145,847.70/218,771.55 = 85,814.55/x
  3. Step 3: Cross multiply
    145,847.70x = 218,771.55 × 85,814.55
  4. Step 4: Simplify right side
    145,847.70x = 18,773,782,116.05
  5. Step 5: Solve for x
    x = 18,773,782,116.05/145,847.70
  6. Step 6: Final answer
    x = 128,721.83

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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.