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Finding the Fourth Proportional to 829.87, 1,145.28 and 480.76

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Solution

The fourth proportional to 829.87, 1,145.28 and 480.76 is: 663.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.87 : 1,145.28 = 480.76 : x
  2. Step 2: Convert to fraction form
    829.87/1,145.28 = 480.76/x
  3. Step 3: Cross multiply
    829.87x = 1,145.28 × 480.76
  4. Step 4: Simplify right side
    829.87x = 550,604.81
  5. Step 5: Solve for x
    x = 550,604.81/829.87
  6. Step 6: Final answer
    x = 663.48

Related Problems

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Half scale
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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.