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Finding the Fourth Proportional to 829.66, 1,145.07 and 480.55

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Solution

The fourth proportional to 829.66, 1,145.07 and 480.55 is: 663.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.66 : 1,145.07 = 480.55 : x
  2. Step 2: Convert to fraction form
    829.66/1,145.07 = 480.55/x
  3. Step 3: Cross multiply
    829.66x = 1,145.07 × 480.55
  4. Step 4: Simplify right side
    829.66x = 550,263.39
  5. Step 5: Solve for x
    x = 550,263.39/829.66
  6. Step 6: Final answer
    x = 663.24

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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.