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Finding the Fourth Proportional to 1,015.75, 1,402.26 and 643.12

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Solution

The fourth proportional to 1,015.75, 1,402.26 and 643.12 is: 887.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.75 : 1,402.26 = 643.12 : x
  2. Step 2: Convert to fraction form
    1,015.75/1,402.26 = 643.12/x
  3. Step 3: Cross multiply
    1,015.75x = 1,402.26 × 643.12
  4. Step 4: Simplify right side
    1,015.75x = 901,821.45
  5. Step 5: Solve for x
    x = 901,821.45/1,015.75
  6. Step 6: Final answer
    x = 887.84

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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.