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Finding the Fourth Proportional to 804.21, 1,105.34 and 710.40

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Solution

The fourth proportional to 804.21, 1,105.34 and 710.40 is: 976.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.21 : 1,105.34 = 710.40 : x
  2. Step 2: Convert to fraction form
    804.21/1,105.34 = 710.40/x
  3. Step 3: Cross multiply
    804.21x = 1,105.34 × 710.40
  4. Step 4: Simplify right side
    804.21x = 785,229.98
  5. Step 5: Solve for x
    x = 785,229.98/804.21
  6. Step 6: Final answer
    x = 976.40

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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.