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Finding the Fourth Proportional to 821.35, 1,132.30 and 555.33

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Solution

The fourth proportional to 821.35, 1,132.30 and 555.33 is: 765.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.35 : 1,132.30 = 555.33 : x
  2. Step 2: Convert to fraction form
    821.35/1,132.30 = 555.33/x
  3. Step 3: Cross multiply
    821.35x = 1,132.30 × 555.33
  4. Step 4: Simplify right side
    821.35x = 628,800.16
  5. Step 5: Solve for x
    x = 628,800.16/821.35
  6. Step 6: Final answer
    x = 765.57

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Double scale
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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.