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Finding the Fourth Proportional to 212,080.88, 318,037.59 and 85,697.26

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Solution

The fourth proportional to 212,080.88, 318,037.59 and 85,697.26 is: 128,512.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,080.88 : 318,037.59 = 85,697.26 : x
  2. Step 2: Convert to fraction form
    212,080.88/318,037.59 = 85,697.26/x
  3. Step 3: Cross multiply
    212,080.88x = 318,037.59 × 85,697.26
  4. Step 4: Simplify right side
    212,080.88x = 27,254,949,244.91
  5. Step 5: Solve for x
    x = 27,254,949,244.91/212,080.88
  6. Step 6: Final answer
    x = 128,512.05

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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.