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Finding the Fourth Proportional to 720.21, 1,075.06 and 618.15

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Solution

The fourth proportional to 720.21, 1,075.06 and 618.15 is: 922.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.21 : 1,075.06 = 618.15 : x
  2. Step 2: Convert to fraction form
    720.21/1,075.06 = 618.15/x
  3. Step 3: Cross multiply
    720.21x = 1,075.06 × 618.15
  4. Step 4: Simplify right side
    720.21x = 664,546.79
  5. Step 5: Solve for x
    x = 664,546.79/720.21
  6. Step 6: Final answer
    x = 922.71

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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.