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Finding the Fourth Proportional to 1,247.07, 1,720.89 and 774.84

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Solution

The fourth proportional to 1,247.07, 1,720.89 and 774.84 is: 1,069.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.07 : 1,720.89 = 774.84 : x
  2. Step 2: Convert to fraction form
    1,247.07/1,720.89 = 774.84/x
  3. Step 3: Cross multiply
    1,247.07x = 1,720.89 × 774.84
  4. Step 4: Simplify right side
    1,247.07x = 1,333,414.41
  5. Step 5: Solve for x
    x = 1,333,414.41/1,247.07
  6. Step 6: Final answer
    x = 1,069.24

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1.5x scale

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.