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Finding the Fourth Proportional to 212,410.88, 318,617.14 and 86,053.51

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Solution

The fourth proportional to 212,410.88, 318,617.14 and 86,053.51 is: 129,080.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,410.88 : 318,617.14 = 86,053.51 : x
  2. Step 2: Convert to fraction form
    212,410.88/318,617.14 = 86,053.51/x
  3. Step 3: Cross multiply
    212,410.88x = 318,617.14 × 86,053.51
  4. Step 4: Simplify right side
    212,410.88x = 27,418,123,243.16
  5. Step 5: Solve for x
    x = 27,418,123,243.16/212,410.88
  6. Step 6: Final answer
    x = 129,080.60

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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.