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Finding the Fourth Proportional to 1,707.13, 2,561.30 and 842.05

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Solution

The fourth proportional to 1,707.13, 2,561.30 and 842.05 is: 1,263.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,707.13 : 2,561.30 = 842.05 : x
  2. Step 2: Convert to fraction form
    1,707.13/2,561.30 = 842.05/x
  3. Step 3: Cross multiply
    1,707.13x = 2,561.30 × 842.05
  4. Step 4: Simplify right side
    1,707.13x = 2,156,725.65
  5. Step 5: Solve for x
    x = 2,156,725.65/1,707.13
  6. Step 6: Final answer
    x = 1,263.37

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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.