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Finding the Fourth Proportional to 1,206.68, 1,809.50 and 686.92

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Solution

The fourth proportional to 1,206.68, 1,809.50 and 686.92 is: 1,030.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.68 : 1,809.50 = 686.92 : x
  2. Step 2: Convert to fraction form
    1,206.68/1,809.50 = 686.92/x
  3. Step 3: Cross multiply
    1,206.68x = 1,809.50 × 686.92
  4. Step 4: Simplify right side
    1,206.68x = 1,242,983.14
  5. Step 5: Solve for x
    x = 1,242,983.14/1,206.68
  6. Step 6: Final answer
    x = 1,030.09

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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.