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Finding the Fourth Proportional to 669.96, 1,005.16 and 424.69

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Solution

The fourth proportional to 669.96, 1,005.16 and 424.69 is: 637.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.96 : 1,005.16 = 424.69 : x
  2. Step 2: Convert to fraction form
    669.96/1,005.16 = 424.69/x
  3. Step 3: Cross multiply
    669.96x = 1,005.16 × 424.69
  4. Step 4: Simplify right side
    669.96x = 426,879.75
  5. Step 5: Solve for x
    x = 426,879.75/669.96
  6. Step 6: Final answer
    x = 637.17

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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.