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Finding the Fourth Proportional to 1,425.90, 1,967.85 and 836.76

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Solution

The fourth proportional to 1,425.90, 1,967.85 and 836.76 is: 1,154.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.90 : 1,967.85 = 836.76 : x
  2. Step 2: Convert to fraction form
    1,425.90/1,967.85 = 836.76/x
  3. Step 3: Cross multiply
    1,425.90x = 1,967.85 × 836.76
  4. Step 4: Simplify right side
    1,425.90x = 1,646,618.17
  5. Step 5: Solve for x
    x = 1,646,618.17/1,425.90
  6. Step 6: Final answer
    x = 1,154.79

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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.