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Finding the Fourth Proportional to 1,018.83, 1,413.19 and 983.86

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Solution

The fourth proportional to 1,018.83, 1,413.19 and 983.86 is: 1,364.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.83 : 1,413.19 = 983.86 : x
  2. Step 2: Convert to fraction form
    1,018.83/1,413.19 = 983.86/x
  3. Step 3: Cross multiply
    1,018.83x = 1,413.19 × 983.86
  4. Step 4: Simplify right side
    1,018.83x = 1,390,381.11
  5. Step 5: Solve for x
    x = 1,390,381.11/1,018.83
  6. Step 6: Final answer
    x = 1,364.68

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.