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Finding the Fourth Proportional to 1,040.36, 1,436.42 and 647.56

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Solution

The fourth proportional to 1,040.36, 1,436.42 and 647.56 is: 894.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.36 : 1,436.42 = 647.56 : x
  2. Step 2: Convert to fraction form
    1,040.36/1,436.42 = 647.56/x
  3. Step 3: Cross multiply
    1,040.36x = 1,436.42 × 647.56
  4. Step 4: Simplify right side
    1,040.36x = 930,168.14
  5. Step 5: Solve for x
    x = 930,168.14/1,040.36
  6. Step 6: Final answer
    x = 894.08

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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.