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Finding the Fourth Proportional to 697.86, 1,047.06 and 307.65

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Solution

The fourth proportional to 697.86, 1,047.06 and 307.65 is: 461.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.86 : 1,047.06 = 307.65 : x
  2. Step 2: Convert to fraction form
    697.86/1,047.06 = 307.65/x
  3. Step 3: Cross multiply
    697.86x = 1,047.06 × 307.65
  4. Step 4: Simplify right side
    697.86x = 322,131.94
  5. Step 5: Solve for x
    x = 322,131.94/697.86
  6. Step 6: Final answer
    x = 461.60

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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.