Home / 1,115.12-1,679.36-972.56

Finding the Fourth Proportional to 1,115.12, 1,679.36 and 972.56

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Solution

The fourth proportional to 1,115.12, 1,679.36 and 972.56 is: 1,464.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.12 : 1,679.36 = 972.56 : x
  2. Step 2: Convert to fraction form
    1,115.12/1,679.36 = 972.56/x
  3. Step 3: Cross multiply
    1,115.12x = 1,679.36 × 972.56
  4. Step 4: Simplify right side
    1,115.12x = 1,633,278.36
  5. Step 5: Solve for x
    x = 1,633,278.36/1,115.12
  6. Step 6: Final answer
    x = 1,464.67

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.