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Finding the Fourth Proportional to 666.23, 918.74 and 518.81

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Solution

The fourth proportional to 666.23, 918.74 and 518.81 is: 715.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.23 : 918.74 = 518.81 : x
  2. Step 2: Convert to fraction form
    666.23/918.74 = 518.81/x
  3. Step 3: Cross multiply
    666.23x = 918.74 × 518.81
  4. Step 4: Simplify right side
    666.23x = 476,648.20
  5. Step 5: Solve for x
    x = 476,648.20/666.23
  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.