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Finding the Fourth Proportional to 772.98, 1,153.53 and 690.96

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Solution

The fourth proportional to 772.98, 1,153.53 and 690.96 is: 1,031.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.98 : 1,153.53 = 690.96 : x
  2. Step 2: Convert to fraction form
    772.98/1,153.53 = 690.96/x
  3. Step 3: Cross multiply
    772.98x = 1,153.53 × 690.96
  4. Step 4: Simplify right side
    772.98x = 797,043.09
  5. Step 5: Solve for x
    x = 797,043.09/772.98
  6. Step 6: Final answer
    x = 1,031.13

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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.