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Finding the Fourth Proportional to 1,308.02, 1,960.11 and 657.86

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Solution

The fourth proportional to 1,308.02, 1,960.11 and 657.86 is: 985.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.02 : 1,960.11 = 657.86 : x
  2. Step 2: Convert to fraction form
    1,308.02/1,960.11 = 657.86/x
  3. Step 3: Cross multiply
    1,308.02x = 1,960.11 × 657.86
  4. Step 4: Simplify right side
    1,308.02x = 1,289,468.16
  5. Step 5: Solve for x
    x = 1,289,468.16/1,308.02
  6. Step 6: Final answer
    x = 985.82

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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.