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Finding the Fourth Proportional to 817.55, 1,128.77 and 628.16

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Solution

The fourth proportional to 817.55, 1,128.77 and 628.16 is: 867.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.55 : 1,128.77 = 628.16 : x
  2. Step 2: Convert to fraction form
    817.55/1,128.77 = 628.16/x
  3. Step 3: Cross multiply
    817.55x = 1,128.77 × 628.16
  4. Step 4: Simplify right side
    817.55x = 709,048.55
  5. Step 5: Solve for x
    x = 709,048.55/817.55
  6. Step 6: Final answer
    x = 867.28

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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.