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Finding the Fourth Proportional to 1,669.72, 2,502.30 and 938.20

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Solution

The fourth proportional to 1,669.72, 2,502.30 and 938.20 is: 1,406.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,669.72 : 2,502.30 = 938.20 : x
  2. Step 2: Convert to fraction form
    1,669.72/2,502.30 = 938.20/x
  3. Step 3: Cross multiply
    1,669.72x = 2,502.30 × 938.20
  4. Step 4: Simplify right side
    1,669.72x = 2,347,657.86
  5. Step 5: Solve for x
    x = 2,347,657.86/1,669.72
  6. Step 6: Final answer
    x = 1,406.02

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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.