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Finding the Fourth Proportional to 802.75, 1,107.80 and 434.75

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Solution

The fourth proportional to 802.75, 1,107.80 and 434.75 is: 599.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.75 : 1,107.80 = 434.75 : x
  2. Step 2: Convert to fraction form
    802.75/1,107.80 = 434.75/x
  3. Step 3: Cross multiply
    802.75x = 1,107.80 × 434.75
  4. Step 4: Simplify right side
    802.75x = 481,613.88
  5. Step 5: Solve for x
    x = 481,613.88/802.75
  6. Step 6: Final answer
    x = 599.96

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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.