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Finding the Fourth Proportional to 1,637.40, 2,457 and 771.69

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Solution

The fourth proportional to 1,637.40, 2,457 and 771.69 is: 1,157.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,637.40 : 2,457 = 771.69 : x
  2. Step 2: Convert to fraction form
    1,637.40/2,457 = 771.69/x
  3. Step 3: Cross multiply
    1,637.40x = 2,457 × 771.69
  4. Step 4: Simplify right side
    1,637.40x = 1,896,042.33
  5. Step 5: Solve for x
    x = 1,896,042.33/1,637.40
  6. Step 6: Final answer
    x = 1,157.96

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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.