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Finding the Fourth Proportional to 828.36, 1,242.54 and 770.04

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Solution

The fourth proportional to 828.36, 1,242.54 and 770.04 is: 1,155.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.36 : 1,242.54 = 770.04 : x
  2. Step 2: Convert to fraction form
    828.36/1,242.54 = 770.04/x
  3. Step 3: Cross multiply
    828.36x = 1,242.54 × 770.04
  4. Step 4: Simplify right side
    828.36x = 956,805.50
  5. Step 5: Solve for x
    x = 956,805.50/828.36
  6. Step 6: Final answer
    x = 1,155.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.