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Finding the Fourth Proportional to 1,402.12, 1,934.93 and 842.91

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Solution

The fourth proportional to 1,402.12, 1,934.93 and 842.91 is: 1,163.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.12 : 1,934.93 = 842.91 : x
  2. Step 2: Convert to fraction form
    1,402.12/1,934.93 = 842.91/x
  3. Step 3: Cross multiply
    1,402.12x = 1,934.93 × 842.91
  4. Step 4: Simplify right side
    1,402.12x = 1,630,960.77
  5. Step 5: Solve for x
    x = 1,630,960.77/1,402.12
  6. Step 6: Final answer
    x = 1,163.21

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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.