Home / 212,028.40-317,921.64-87,220.72

Finding the Fourth Proportional to 212,028.40, 317,921.64 and 87,220.72

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Solution

The fourth proportional to 212,028.40, 317,921.64 and 87,220.72 is: 130,781.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,028.40 : 317,921.64 = 87,220.72 : x
  2. Step 2: Convert to fraction form
    212,028.40/317,921.64 = 87,220.72/x
  3. Step 3: Cross multiply
    212,028.40x = 317,921.64 × 87,220.72
  4. Step 4: Simplify right side
    212,028.40x = 27,729,354,344.38
  5. Step 5: Solve for x
    x = 27,729,354,344.38/212,028.40
  6. Step 6: Final answer
    x = 130,781.32

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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.