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Finding the Fourth Proportional to 1,642.37, 2,266.53 and 979.28

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Solution

The fourth proportional to 1,642.37, 2,266.53 and 979.28 is: 1,351.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.37 : 2,266.53 = 979.28 : x
  2. Step 2: Convert to fraction form
    1,642.37/2,266.53 = 979.28/x
  3. Step 3: Cross multiply
    1,642.37x = 2,266.53 × 979.28
  4. Step 4: Simplify right side
    1,642.37x = 2,219,556.17
  5. Step 5: Solve for x
    x = 2,219,556.17/1,642.37
  6. Step 6: Final answer
    x = 1,351.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.