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Finding the Fourth Proportional to 665.15, 918.48 and 635.46

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Solution

The fourth proportional to 665.15, 918.48 and 635.46 is: 877.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.15 : 918.48 = 635.46 : x
  2. Step 2: Convert to fraction form
    665.15/918.48 = 635.46/x
  3. Step 3: Cross multiply
    665.15x = 918.48 × 635.46
  4. Step 4: Simplify right side
    665.15x = 583,657.30
  5. Step 5: Solve for x
    x = 583,657.30/665.15
  6. Step 6: Final answer
    x = 877.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.