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Finding the Fourth Proportional to 1,245.30, 1,717.93 and 747.07

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Solution

The fourth proportional to 1,245.30, 1,717.93 and 747.07 is: 1,030.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.30 : 1,717.93 = 747.07 : x
  2. Step 2: Convert to fraction form
    1,245.30/1,717.93 = 747.07/x
  3. Step 3: Cross multiply
    1,245.30x = 1,717.93 × 747.07
  4. Step 4: Simplify right side
    1,245.30x = 1,283,413.97
  5. Step 5: Solve for x
    x = 1,283,413.97/1,245.30
  6. Step 6: Final answer
    x = 1,030.61

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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.