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Finding the Fourth Proportional to 817.22, 1,128.69 and 554.78

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Solution

The fourth proportional to 817.22, 1,128.69 and 554.78 is: 766.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.22 : 1,128.69 = 554.78 : x
  2. Step 2: Convert to fraction form
    817.22/1,128.69 = 554.78/x
  3. Step 3: Cross multiply
    817.22x = 1,128.69 × 554.78
  4. Step 4: Simplify right side
    817.22x = 626,168.99
  5. Step 5: Solve for x
    x = 626,168.99/817.22
  6. Step 6: Final answer
    x = 766.22

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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.