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Finding the Fourth Proportional to 825.51, 1,139.09 and 515.01

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Solution

The fourth proportional to 825.51, 1,139.09 and 515.01 is: 710.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.51 : 1,139.09 = 515.01 : x
  2. Step 2: Convert to fraction form
    825.51/1,139.09 = 515.01/x
  3. Step 3: Cross multiply
    825.51x = 1,139.09 × 515.01
  4. Step 4: Simplify right side
    825.51x = 586,640.17
  5. Step 5: Solve for x
    x = 586,640.17/825.51
  6. Step 6: Final answer
    x = 710.64

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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.