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Finding the Fourth Proportional to 1,308.65, 1,960.50 and 649.76

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Solution

The fourth proportional to 1,308.65, 1,960.50 and 649.76 is: 973.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.65 : 1,960.50 = 649.76 : x
  2. Step 2: Convert to fraction form
    1,308.65/1,960.50 = 649.76/x
  3. Step 3: Cross multiply
    1,308.65x = 1,960.50 × 649.76
  4. Step 4: Simplify right side
    1,308.65x = 1,273,854.48
  5. Step 5: Solve for x
    x = 1,273,854.48/1,308.65
  6. Step 6: Final answer
    x = 973.41

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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.