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Finding the Fourth Proportional to 1,509.38, 2,264.34 and 643.76

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Solution

The fourth proportional to 1,509.38, 2,264.34 and 643.76 is: 965.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.38 : 2,264.34 = 643.76 : x
  2. Step 2: Convert to fraction form
    1,509.38/2,264.34 = 643.76/x
  3. Step 3: Cross multiply
    1,509.38x = 2,264.34 × 643.76
  4. Step 4: Simplify right side
    1,509.38x = 1,457,691.52
  5. Step 5: Solve for x
    x = 1,457,691.52/1,509.38
  6. Step 6: Final answer
    x = 965.76

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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.