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Finding the Fourth Proportional to 698.06, 1,046.76 and 405.65

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Solution

The fourth proportional to 698.06, 1,046.76 and 405.65 is: 608.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.06 : 1,046.76 = 405.65 : x
  2. Step 2: Convert to fraction form
    698.06/1,046.76 = 405.65/x
  3. Step 3: Cross multiply
    698.06x = 1,046.76 × 405.65
  4. Step 4: Simplify right side
    698.06x = 424,618.19
  5. Step 5: Solve for x
    x = 424,618.19/698.06
  6. Step 6: Final answer
    x = 608.28

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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.