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Finding the Fourth Proportional to 816.58, 1,126.68 and 485.11

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Solution

The fourth proportional to 816.58, 1,126.68 and 485.11 is: 669.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.58 : 1,126.68 = 485.11 : x
  2. Step 2: Convert to fraction form
    816.58/1,126.68 = 485.11/x
  3. Step 3: Cross multiply
    816.58x = 1,126.68 × 485.11
  4. Step 4: Simplify right side
    816.58x = 546,563.73
  5. Step 5: Solve for x
    x = 546,563.73/816.58
  6. Step 6: Final answer
    x = 669.33

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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.