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Finding the Fourth Proportional to 669.72, 1,005.09 and 465.72

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Solution

The fourth proportional to 669.72, 1,005.09 and 465.72 is: 698.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.72 : 1,005.09 = 465.72 : x
  2. Step 2: Convert to fraction form
    669.72/1,005.09 = 465.72/x
  3. Step 3: Cross multiply
    669.72x = 1,005.09 × 465.72
  4. Step 4: Simplify right side
    669.72x = 468,090.51
  5. Step 5: Solve for x
    x = 468,090.51/669.72
  6. Step 6: Final answer
    x = 698.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.