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Finding the Fourth Proportional to 1,208.60, 1,812.90 and 661.86

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Solution

The fourth proportional to 1,208.60, 1,812.90 and 661.86 is: 992.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.60 : 1,812.90 = 661.86 : x
  2. Step 2: Convert to fraction form
    1,208.60/1,812.90 = 661.86/x
  3. Step 3: Cross multiply
    1,208.60x = 1,812.90 × 661.86
  4. Step 4: Simplify right side
    1,208.60x = 1,199,885.99
  5. Step 5: Solve for x
    x = 1,199,885.99/1,208.60
  6. Step 6: Final answer
    x = 992.79

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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.