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Finding the Fourth Proportional to 1,273.99, 1,911.17 and 657.76

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Solution

The fourth proportional to 1,273.99, 1,911.17 and 657.76 is: 986.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.99 : 1,911.17 = 657.76 : x
  2. Step 2: Convert to fraction form
    1,273.99/1,911.17 = 657.76/x
  3. Step 3: Cross multiply
    1,273.99x = 1,911.17 × 657.76
  4. Step 4: Simplify right side
    1,273.99x = 1,257,091.18
  5. Step 5: Solve for x
    x = 1,257,091.18/1,273.99
  6. Step 6: Final answer
    x = 986.74

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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.