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Finding the Fourth Proportional to 1,020.47, 1,534.40 and 940.28

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Solution

The fourth proportional to 1,020.47, 1,534.40 and 940.28 is: 1,413.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.47 : 1,534.40 = 940.28 : x
  2. Step 2: Convert to fraction form
    1,020.47/1,534.40 = 940.28/x
  3. Step 3: Cross multiply
    1,020.47x = 1,534.40 × 940.28
  4. Step 4: Simplify right side
    1,020.47x = 1,442,760.93
  5. Step 5: Solve for x
    x = 1,442,760.93/1,020.47
  6. Step 6: Final answer
    x = 1,413.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.