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Finding the Fourth Proportional to 830.19, 1,145.90 and 480.94

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Solution

The fourth proportional to 830.19, 1,145.90 and 480.94 is: 663.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.19 : 1,145.90 = 480.94 : x
  2. Step 2: Convert to fraction form
    830.19/1,145.90 = 480.94/x
  3. Step 3: Cross multiply
    830.19x = 1,145.90 × 480.94
  4. Step 4: Simplify right side
    830.19x = 551,109.15
  5. Step 5: Solve for x
    x = 551,109.15/830.19
  6. Step 6: Final answer
    x = 663.83

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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.