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Finding the Fourth Proportional to 485.88, 665.70 and 479.81

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Solution

The fourth proportional to 485.88, 665.70 and 479.81 is: 657.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.88 : 665.70 = 479.81 : x
  2. Step 2: Convert to fraction form
    485.88/665.70 = 479.81/x
  3. Step 3: Cross multiply
    485.88x = 665.70 × 479.81
  4. Step 4: Simplify right side
    485.88x = 319,406.19
  5. Step 5: Solve for x
    x = 319,406.19/485.88
  6. Step 6: Final answer
    x = 657.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.