Home / 212,981.40-320,128.20-201,171.60

Finding the Fourth Proportional to 212,981.40, 320,128.20 and 201,171.60

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Solution

The fourth proportional to 212,981.40, 320,128.20 and 201,171.60 is: 302,377.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,981.40 : 320,128.20 = 201,171.60 : x
  2. Step 2: Convert to fraction form
    212,981.40/320,128.20 = 201,171.60/x
  3. Step 3: Cross multiply
    212,981.40x = 320,128.20 × 201,171.60
  4. Step 4: Simplify right side
    212,981.40x = 64,400,702,199.12
  5. Step 5: Solve for x
    x = 64,400,702,199.12/212,981.40
  6. Step 6: Final answer
    x = 302,377.12

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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.