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Finding the Fourth Proportional to 1,394.39, 2,091.65 and 777.63

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Solution

The fourth proportional to 1,394.39, 2,091.65 and 777.63 is: 1,166.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.39 : 2,091.65 = 777.63 : x
  2. Step 2: Convert to fraction form
    1,394.39/2,091.65 = 777.63/x
  3. Step 3: Cross multiply
    1,394.39x = 2,091.65 × 777.63
  4. Step 4: Simplify right side
    1,394.39x = 1,626,529.79
  5. Step 5: Solve for x
    x = 1,626,529.79/1,394.39
  6. Step 6: Final answer
    x = 1,166.48

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1.5x scale

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.