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Finding the Fourth Proportional to 747.45, 1,118.73 and 413.40

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Solution

The fourth proportional to 747.45, 1,118.73 and 413.40 is: 618.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.45 : 1,118.73 = 413.40 : x
  2. Step 2: Convert to fraction form
    747.45/1,118.73 = 413.40/x
  3. Step 3: Cross multiply
    747.45x = 1,118.73 × 413.40
  4. Step 4: Simplify right side
    747.45x = 462,480.34
  5. Step 5: Solve for x
    x = 462,480.34/747.45
  6. Step 6: Final answer
    x = 618.74

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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.