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Finding the Fourth Proportional to 1,185.71, 1,778.74 and 637.15

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Solution

The fourth proportional to 1,185.71, 1,778.74 and 637.15 is: 955.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.71 : 1,778.74 = 637.15 : x
  2. Step 2: Convert to fraction form
    1,185.71/1,778.74 = 637.15/x
  3. Step 3: Cross multiply
    1,185.71x = 1,778.74 × 637.15
  4. Step 4: Simplify right side
    1,185.71x = 1,133,321.01
  5. Step 5: Solve for x
    x = 1,133,321.01/1,185.71
  6. Step 6: Final answer
    x = 955.82

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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.