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Finding the Fourth Proportional to 657.65, 986.75 and 485.19

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Solution

The fourth proportional to 657.65, 986.75 and 485.19 is: 727.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.65 : 986.75 = 485.19 : x
  2. Step 2: Convert to fraction form
    657.65/986.75 = 485.19/x
  3. Step 3: Cross multiply
    657.65x = 986.75 × 485.19
  4. Step 4: Simplify right side
    657.65x = 478,760.63
  5. Step 5: Solve for x
    x = 478,760.63/657.65
  6. Step 6: Final answer
    x = 727.98

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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.