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Finding the Fourth Proportional to 666.63, 918.95 and 479.79

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Solution

The fourth proportional to 666.63, 918.95 and 479.79 is: 661.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.63 : 918.95 = 479.79 : x
  2. Step 2: Convert to fraction form
    666.63/918.95 = 479.79/x
  3. Step 3: Cross multiply
    666.63x = 918.95 × 479.79
  4. Step 4: Simplify right side
    666.63x = 440,900.62
  5. Step 5: Solve for x
    x = 440,900.62/666.63
  6. Step 6: Final answer
    x = 661.39

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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.