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Finding the Fourth Proportional to 1,207.09, 1,812.68 and 660.34

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Solution

The fourth proportional to 1,207.09, 1,812.68 and 660.34 is: 991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.09 : 1,812.68 = 660.34 : x
  2. Step 2: Convert to fraction form
    1,207.09/1,812.68 = 660.34/x
  3. Step 3: Cross multiply
    1,207.09x = 1,812.68 × 660.34
  4. Step 4: Simplify right side
    1,207.09x = 1,196,985.11
  5. Step 5: Solve for x
    x = 1,196,985.11/1,207.09
  6. Step 6: Final answer
    x = 991.63

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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.