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Finding the Fourth Proportional to 698.69, 1,048.07 and 670.07

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Solution

The fourth proportional to 698.69, 1,048.07 and 670.07 is: 1,005.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.69 : 1,048.07 = 670.07 : x
  2. Step 2: Convert to fraction form
    698.69/1,048.07 = 670.07/x
  3. Step 3: Cross multiply
    698.69x = 1,048.07 × 670.07
  4. Step 4: Simplify right side
    698.69x = 702,284.56
  5. Step 5: Solve for x
    x = 702,284.56/698.69
  6. Step 6: Final answer
    x = 1,005.14

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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.