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Finding the Fourth Proportional to 2,389.51, 3,580.02 and 999.79

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Solution

The fourth proportional to 2,389.51, 3,580.02 and 999.79 is: 1,497.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,389.51 : 3,580.02 = 999.79 : x
  2. Step 2: Convert to fraction form
    2,389.51/3,580.02 = 999.79/x
  3. Step 3: Cross multiply
    2,389.51x = 3,580.02 × 999.79
  4. Step 4: Simplify right side
    2,389.51x = 3,579,268.20
  5. Step 5: Solve for x
    x = 3,579,268.20/2,389.51
  6. Step 6: Final answer
    x = 1,497.91

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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.