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Finding the Fourth Proportional to 1,185.51, 1,778.24 and 638.76

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Solution

The fourth proportional to 1,185.51, 1,778.24 and 638.76 is: 958.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.51 : 1,778.24 = 638.76 : x
  2. Step 2: Convert to fraction form
    1,185.51/1,778.24 = 638.76/x
  3. Step 3: Cross multiply
    1,185.51x = 1,778.24 × 638.76
  4. Step 4: Simplify right side
    1,185.51x = 1,135,865.39
  5. Step 5: Solve for x
    x = 1,135,865.39/1,185.51
  6. Step 6: Final answer
    x = 958.12

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1.5x scale

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.