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Finding the Fourth Proportional to 772.36, 1,153.29 and 608.20

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Solution

The fourth proportional to 772.36, 1,153.29 and 608.20 is: 908.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.36 : 1,153.29 = 608.20 : x
  2. Step 2: Convert to fraction form
    772.36/1,153.29 = 608.20/x
  3. Step 3: Cross multiply
    772.36x = 1,153.29 × 608.20
  4. Step 4: Simplify right side
    772.36x = 701,430.98
  5. Step 5: Solve for x
    x = 701,430.98/772.36
  6. Step 6: Final answer
    x = 908.17

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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.