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Finding the Fourth Proportional to 1,555.83, 2,147.13 and 857.21

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Solution

The fourth proportional to 1,555.83, 2,147.13 and 857.21 is: 1,182.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.83 : 2,147.13 = 857.21 : x
  2. Step 2: Convert to fraction form
    1,555.83/2,147.13 = 857.21/x
  3. Step 3: Cross multiply
    1,555.83x = 2,147.13 × 857.21
  4. Step 4: Simplify right side
    1,555.83x = 1,840,530.57
  5. Step 5: Solve for x
    x = 1,840,530.57/1,555.83
  6. Step 6: Final answer
    x = 1,182.99

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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.