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Finding the Fourth Proportional to 1,509, 2,263.96 and 643.38

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Solution

The fourth proportional to 1,509, 2,263.96 and 643.38 is: 965.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509 : 2,263.96 = 643.38 : x
  2. Step 2: Convert to fraction form
    1,509/2,263.96 = 643.38/x
  3. Step 3: Cross multiply
    1,509x = 2,263.96 × 643.38
  4. Step 4: Simplify right side
    1,509x = 1,456,586.58
  5. Step 5: Solve for x
    x = 1,456,586.58/1,509
  6. Step 6: Final answer
    x = 965.27

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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.