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Finding the Fourth Proportional to 1,372, 2,054.76 and 1,212.16

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Solution

The fourth proportional to 1,372, 2,054.76 and 1,212.16 is: 1,815.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372 : 2,054.76 = 1,212.16 : x
  2. Step 2: Convert to fraction form
    1,372/2,054.76 = 1,212.16/x
  3. Step 3: Cross multiply
    1,372x = 2,054.76 × 1,212.16
  4. Step 4: Simplify right side
    1,372x = 2,490,697.88
  5. Step 5: Solve for x
    x = 2,490,697.88/1,372
  6. Step 6: Final answer
    x = 1,815.38

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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.