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Finding the Fourth Proportional to 1,170.36, 1,613.34 and 820.44

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Solution

The fourth proportional to 1,170.36, 1,613.34 and 820.44 is: 1,130.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.36 : 1,613.34 = 820.44 : x
  2. Step 2: Convert to fraction form
    1,170.36/1,613.34 = 820.44/x
  3. Step 3: Cross multiply
    1,170.36x = 1,613.34 × 820.44
  4. Step 4: Simplify right side
    1,170.36x = 1,323,648.67
  5. Step 5: Solve for x
    x = 1,323,648.67/1,170.36
  6. Step 6: Final answer
    x = 1,130.98

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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.