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Finding the Fourth Proportional to 825.57, 1,139.40 and 628.74

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Solution

The fourth proportional to 825.57, 1,139.40 and 628.74 is: 867.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.57 : 1,139.40 = 628.74 : x
  2. Step 2: Convert to fraction form
    825.57/1,139.40 = 628.74/x
  3. Step 3: Cross multiply
    825.57x = 1,139.40 × 628.74
  4. Step 4: Simplify right side
    825.57x = 716,386.36
  5. Step 5: Solve for x
    x = 716,386.36/825.57
  6. Step 6: Final answer
    x = 867.75

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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.