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Finding the Fourth Proportional to 1,003.77, 1,386.63 and 955.17

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Solution

The fourth proportional to 1,003.77, 1,386.63 and 955.17 is: 1,319.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.77 : 1,386.63 = 955.17 : x
  2. Step 2: Convert to fraction form
    1,003.77/1,386.63 = 955.17/x
  3. Step 3: Cross multiply
    1,003.77x = 1,386.63 × 955.17
  4. Step 4: Simplify right side
    1,003.77x = 1,324,467.38
  5. Step 5: Solve for x
    x = 1,324,467.38/1,003.77
  6. Step 6: Final answer
    x = 1,319.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.