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Finding the Fourth Proportional to 212,141.70, 318,173.67 and 85,775.22

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Solution

The fourth proportional to 212,141.70, 318,173.67 and 85,775.22 is: 128,647.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,141.70 : 318,173.67 = 85,775.22 : x
  2. Step 2: Convert to fraction form
    212,141.70/318,173.67 = 85,775.22/x
  3. Step 3: Cross multiply
    212,141.70x = 318,173.67 × 85,775.22
  4. Step 4: Simplify right side
    212,141.70x = 27,291,416,542.46
  5. Step 5: Solve for x
    x = 27,291,416,542.46/212,141.70
  6. Step 6: Final answer
    x = 128,647.11

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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.