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Finding the Fourth Proportional to 669.96, 1,007.10 and 415.08

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Solution

The fourth proportional to 669.96, 1,007.10 and 415.08 is: 623.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.96 : 1,007.10 = 415.08 : x
  2. Step 2: Convert to fraction form
    669.96/1,007.10 = 415.08/x
  3. Step 3: Cross multiply
    669.96x = 1,007.10 × 415.08
  4. Step 4: Simplify right side
    669.96x = 418,027.07
  5. Step 5: Solve for x
    x = 418,027.07/669.96
  6. Step 6: Final answer
    x = 623.96

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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.