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Finding the Fourth Proportional to 802.71, 1,107.78 and 627.75

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Solution

The fourth proportional to 802.71, 1,107.78 and 627.75 is: 866.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.71 : 1,107.78 = 627.75 : x
  2. Step 2: Convert to fraction form
    802.71/1,107.78 = 627.75/x
  3. Step 3: Cross multiply
    802.71x = 1,107.78 × 627.75
  4. Step 4: Simplify right side
    802.71x = 695,406.54
  5. Step 5: Solve for x
    x = 695,406.54/802.71
  6. Step 6: Final answer
    x = 866.32

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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.