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Finding the Fourth Proportional to 2,386.64, 3,579.93 and 980.79

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Solution

The fourth proportional to 2,386.64, 3,579.93 and 980.79 is: 1,471.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,386.64 : 3,579.93 = 980.79 : x
  2. Step 2: Convert to fraction form
    2,386.64/3,579.93 = 980.79/x
  3. Step 3: Cross multiply
    2,386.64x = 3,579.93 × 980.79
  4. Step 4: Simplify right side
    2,386.64x = 3,511,159.54
  5. Step 5: Solve for x
    x = 3,511,159.54/2,386.64
  6. Step 6: Final answer
    x = 1,471.18

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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.