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Finding the Fourth Proportional to 657.75, 986.99 and 315.75

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Solution

The fourth proportional to 657.75, 986.99 and 315.75 is: 473.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.75 : 986.99 = 315.75 : x
  2. Step 2: Convert to fraction form
    657.75/986.99 = 315.75/x
  3. Step 3: Cross multiply
    657.75x = 986.99 × 315.75
  4. Step 4: Simplify right side
    657.75x = 311,640.51
  5. Step 5: Solve for x
    x = 311,640.51/657.75
  6. Step 6: Final answer
    x = 473.80

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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.