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Finding the Fourth Proportional to 665.96, 918.78 and 469.64

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Solution

The fourth proportional to 665.96, 918.78 and 469.64 is: 647.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.96 : 918.78 = 469.64 : x
  2. Step 2: Convert to fraction form
    665.96/918.78 = 469.64/x
  3. Step 3: Cross multiply
    665.96x = 918.78 × 469.64
  4. Step 4: Simplify right side
    665.96x = 431,495.84
  5. Step 5: Solve for x
    x = 431,495.84/665.96
  6. Step 6: Final answer
    x = 647.93

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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.