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Finding the Fourth Proportional to 1,178.15, 1,625.87 and 654.21

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Solution

The fourth proportional to 1,178.15, 1,625.87 and 654.21 is: 902.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.15 : 1,625.87 = 654.21 : x
  2. Step 2: Convert to fraction form
    1,178.15/1,625.87 = 654.21/x
  3. Step 3: Cross multiply
    1,178.15x = 1,625.87 × 654.21
  4. Step 4: Simplify right side
    1,178.15x = 1,063,662.05
  5. Step 5: Solve for x
    x = 1,063,662.05/1,178.15
  6. Step 6: Final answer
    x = 902.83

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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.