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Finding the Fourth Proportional to 931.07, 1,395.01 and 669.83

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Solution

The fourth proportional to 931.07, 1,395.01 and 669.83 is: 1,003.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.07 : 1,395.01 = 669.83 : x
  2. Step 2: Convert to fraction form
    931.07/1,395.01 = 669.83/x
  3. Step 3: Cross multiply
    931.07x = 1,395.01 × 669.83
  4. Step 4: Simplify right side
    931.07x = 934,413.45
  5. Step 5: Solve for x
    x = 934,413.45/931.07
  6. Step 6: Final answer
    x = 1,003.59

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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.