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Finding the Fourth Proportional to 771.24, 1,064.19 and 490.98

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Solution

The fourth proportional to 771.24, 1,064.19 and 490.98 is: 677.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.24 : 1,064.19 = 490.98 : x
  2. Step 2: Convert to fraction form
    771.24/1,064.19 = 490.98/x
  3. Step 3: Cross multiply
    771.24x = 1,064.19 × 490.98
  4. Step 4: Simplify right side
    771.24x = 522,496.01
  5. Step 5: Solve for x
    x = 522,496.01/771.24
  6. Step 6: Final answer
    x = 677.48

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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.