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Finding the Fourth Proportional to 698.13, 1,047.15 and 302.82

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Solution

The fourth proportional to 698.13, 1,047.15 and 302.82 is: 454.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.13 : 1,047.15 = 302.82 : x
  2. Step 2: Convert to fraction form
    698.13/1,047.15 = 302.82/x
  3. Step 3: Cross multiply
    698.13x = 1,047.15 × 302.82
  4. Step 4: Simplify right side
    698.13x = 317,097.96
  5. Step 5: Solve for x
    x = 317,097.96/698.13
  6. Step 6: Final answer
    x = 454.21

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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.