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Finding the Fourth Proportional to 1,206.63, 1,665.15 and 654.63

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Solution

The fourth proportional to 1,206.63, 1,665.15 and 654.63 is: 903.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.63 : 1,665.15 = 654.63 : x
  2. Step 2: Convert to fraction form
    1,206.63/1,665.15 = 654.63/x
  3. Step 3: Cross multiply
    1,206.63x = 1,665.15 × 654.63
  4. Step 4: Simplify right side
    1,206.63x = 1,090,057.14
  5. Step 5: Solve for x
    x = 1,090,057.14/1,206.63
  6. Step 6: Final answer
    x = 903.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.