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Finding the Fourth Proportional to 772.07, 1,064.58 and 649.05

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Solution

The fourth proportional to 772.07, 1,064.58 and 649.05 is: 894.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.07 : 1,064.58 = 649.05 : x
  2. Step 2: Convert to fraction form
    772.07/1,064.58 = 649.05/x
  3. Step 3: Cross multiply
    772.07x = 1,064.58 × 649.05
  4. Step 4: Simplify right side
    772.07x = 690,959.22
  5. Step 5: Solve for x
    x = 690,959.22/772.07
  6. Step 6: Final answer
    x = 894.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.