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Finding the Fourth Proportional to 1,209.39, 1,668.93 and 657.39

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Solution

The fourth proportional to 1,209.39, 1,668.93 and 657.39 is: 907.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.39 : 1,668.93 = 657.39 : x
  2. Step 2: Convert to fraction form
    1,209.39/1,668.93 = 657.39/x
  3. Step 3: Cross multiply
    1,209.39x = 1,668.93 × 657.39
  4. Step 4: Simplify right side
    1,209.39x = 1,097,137.89
  5. Step 5: Solve for x
    x = 1,097,137.89/1,209.39
  6. Step 6: Final answer
    x = 907.18

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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.