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Finding the Fourth Proportional to 774.57, 1,062.35 and 687.09

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Solution

The fourth proportional to 774.57, 1,062.35 and 687.09 is: 942.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.57 : 1,062.35 = 687.09 : x
  2. Step 2: Convert to fraction form
    774.57/1,062.35 = 687.09/x
  3. Step 3: Cross multiply
    774.57x = 1,062.35 × 687.09
  4. Step 4: Simplify right side
    774.57x = 729,931.78
  5. Step 5: Solve for x
    x = 729,931.78/774.57
  6. Step 6: Final answer
    x = 942.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.