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Finding the Fourth Proportional to 1,209.50, 1,658.25 and 1,187.63

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Solution

The fourth proportional to 1,209.50, 1,658.25 and 1,187.63 is: 1,628.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.50 : 1,658.25 = 1,187.63 : x
  2. Step 2: Convert to fraction form
    1,209.50/1,658.25 = 1,187.63/x
  3. Step 3: Cross multiply
    1,209.50x = 1,658.25 × 1,187.63
  4. Step 4: Simplify right side
    1,209.50x = 1,969,385.65
  5. Step 5: Solve for x
    x = 1,969,385.65/1,209.50
  6. Step 6: Final answer
    x = 1,628.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.