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Finding the Fourth Proportional to 1,268.48, 1,750.40 and 802.56

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Solution

The fourth proportional to 1,268.48, 1,750.40 and 802.56 is: 1,107.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.48 : 1,750.40 = 802.56 : x
  2. Step 2: Convert to fraction form
    1,268.48/1,750.40 = 802.56/x
  3. Step 3: Cross multiply
    1,268.48x = 1,750.40 × 802.56
  4. Step 4: Simplify right side
    1,268.48x = 1,404,801.02
  5. Step 5: Solve for x
    x = 1,404,801.02/1,268.48
  6. Step 6: Final answer
    x = 1,107.47

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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.