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Finding the Fourth Proportional to 1,248.66, 1,716.93 and 1,128.38

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Solution

The fourth proportional to 1,248.66, 1,716.93 and 1,128.38 is: 1,551.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.66 : 1,716.93 = 1,128.38 : x
  2. Step 2: Convert to fraction form
    1,248.66/1,716.93 = 1,128.38/x
  3. Step 3: Cross multiply
    1,248.66x = 1,716.93 × 1,128.38
  4. Step 4: Simplify right side
    1,248.66x = 1,937,340.89
  5. Step 5: Solve for x
    x = 1,937,340.89/1,248.66
  6. Step 6: Final answer
    x = 1,551.54

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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.