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Finding the Fourth Proportional to 830.32, 1,145.94 and 480.94

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Solution

The fourth proportional to 830.32, 1,145.94 and 480.94 is: 663.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.32 : 1,145.94 = 480.94 : x
  2. Step 2: Convert to fraction form
    830.32/1,145.94 = 480.94/x
  3. Step 3: Cross multiply
    830.32x = 1,145.94 × 480.94
  4. Step 4: Simplify right side
    830.32x = 551,122.65
  5. Step 5: Solve for x
    x = 551,122.65/830.32
  6. Step 6: Final answer
    x = 663.75

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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.