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Finding the Fourth Proportional to 1,307.54, 1,961.53 and 649.45

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Solution

The fourth proportional to 1,307.54, 1,961.53 and 649.45 is: 974.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.54 : 1,961.53 = 649.45 : x
  2. Step 2: Convert to fraction form
    1,307.54/1,961.53 = 649.45/x
  3. Step 3: Cross multiply
    1,307.54x = 1,961.53 × 649.45
  4. Step 4: Simplify right side
    1,307.54x = 1,273,920.14
  5. Step 5: Solve for x
    x = 1,273,920.14/1,307.54
  6. Step 6: Final answer
    x = 974.29

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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.