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Finding the Fourth Proportional to 669.56, 1,003.80 and 207.05

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Solution

The fourth proportional to 669.56, 1,003.80 and 207.05 is: 310.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.56 : 1,003.80 = 207.05 : x
  2. Step 2: Convert to fraction form
    669.56/1,003.80 = 207.05/x
  3. Step 3: Cross multiply
    669.56x = 1,003.80 × 207.05
  4. Step 4: Simplify right side
    669.56x = 207,831.77
  5. Step 5: Solve for x
    x = 207,831.77/669.56
  6. Step 6: Final answer
    x = 310.40

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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.