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Finding the Fourth Proportional to 945.87, 1,413.20 and 913.57

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Solution

The fourth proportional to 945.87, 1,413.20 and 913.57 is: 1,364.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.87 : 1,413.20 = 913.57 : x
  2. Step 2: Convert to fraction form
    945.87/1,413.20 = 913.57/x
  3. Step 3: Cross multiply
    945.87x = 1,413.20 × 913.57
  4. Step 4: Simplify right side
    945.87x = 1,291,063.82
  5. Step 5: Solve for x
    x = 1,291,063.82/945.87
  6. Step 6: Final answer
    x = 1,364.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.