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Finding the Fourth Proportional to 665.16, 918.30 and 479.12

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Solution

The fourth proportional to 665.16, 918.30 and 479.12 is: 661.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.16 : 918.30 = 479.12 : x
  2. Step 2: Convert to fraction form
    665.16/918.30 = 479.12/x
  3. Step 3: Cross multiply
    665.16x = 918.30 × 479.12
  4. Step 4: Simplify right side
    665.16x = 439,975.90
  5. Step 5: Solve for x
    x = 439,975.90/665.16
  6. Step 6: Final answer
    x = 661.46

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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.