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Finding the Fourth Proportional to 1,556.84, 2,148.39 and 858.21

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Solution

The fourth proportional to 1,556.84, 2,148.39 and 858.21 is: 1,184.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,556.84 : 2,148.39 = 858.21 : x
  2. Step 2: Convert to fraction form
    1,556.84/2,148.39 = 858.21/x
  3. Step 3: Cross multiply
    1,556.84x = 2,148.39 × 858.21
  4. Step 4: Simplify right side
    1,556.84x = 1,843,769.78
  5. Step 5: Solve for x
    x = 1,843,769.78/1,556.84
  6. Step 6: Final answer
    x = 1,184.31

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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.