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Finding the Fourth Proportional to 1,383.12, 1,907.82 and 917.28

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Solution

The fourth proportional to 1,383.12, 1,907.82 and 917.28 is: 1,265.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.12 : 1,907.82 = 917.28 : x
  2. Step 2: Convert to fraction form
    1,383.12/1,907.82 = 917.28/x
  3. Step 3: Cross multiply
    1,383.12x = 1,907.82 × 917.28
  4. Step 4: Simplify right side
    1,383.12x = 1,750,005.13
  5. Step 5: Solve for x
    x = 1,750,005.13/1,383.12
  6. Step 6: Final answer
    x = 1,265.26

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1.5x scale

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.