Home / 212,100.18-318,380.81-85,827.35

Finding the Fourth Proportional to 212,100.18, 318,380.81 and 85,827.35

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Solution

The fourth proportional to 212,100.18, 318,380.81 and 85,827.35 is: 128,834.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,100.18 : 318,380.81 = 85,827.35 : x
  2. Step 2: Convert to fraction form
    212,100.18/318,380.81 = 85,827.35/x
  3. Step 3: Cross multiply
    212,100.18x = 318,380.81 × 85,827.35
  4. Step 4: Simplify right side
    212,100.18x = 27,325,782,062.75
  5. Step 5: Solve for x
    x = 27,325,782,062.75/212,100.18
  6. Step 6: Final answer
    x = 128,834.32

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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.