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Finding the Fourth Proportional to 830.10, 1,145.26 and 480.54

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Solution

The fourth proportional to 830.10, 1,145.26 and 480.54 is: 662.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.10 : 1,145.26 = 480.54 : x
  2. Step 2: Convert to fraction form
    830.10/1,145.26 = 480.54/x
  3. Step 3: Cross multiply
    830.10x = 1,145.26 × 480.54
  4. Step 4: Simplify right side
    830.10x = 550,335.11
  5. Step 5: Solve for x
    x = 550,335.11/830.10
  6. Step 6: Final answer
    x = 662.98

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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.