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Finding the Fourth Proportional to 665.70, 918.63 and 518.46

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Solution

The fourth proportional to 665.70, 918.63 and 518.46 is: 715.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.70 : 918.63 = 518.46 : x
  2. Step 2: Convert to fraction form
    665.70/918.63 = 518.46/x
  3. Step 3: Cross multiply
    665.70x = 918.63 × 518.46
  4. Step 4: Simplify right side
    665.70x = 476,272.91
  5. Step 5: Solve for x
    x = 476,272.91/665.70
  6. Step 6: Final answer
    x = 715.45

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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.