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Finding the Fourth Proportional to 1,225.82, 1,690.50 and 782.96

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Solution

The fourth proportional to 1,225.82, 1,690.50 and 782.96 is: 1,079.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.82 : 1,690.50 = 782.96 : x
  2. Step 2: Convert to fraction form
    1,225.82/1,690.50 = 782.96/x
  3. Step 3: Cross multiply
    1,225.82x = 1,690.50 × 782.96
  4. Step 4: Simplify right side
    1,225.82x = 1,323,593.88
  5. Step 5: Solve for x
    x = 1,323,593.88/1,225.82
  6. Step 6: Final answer
    x = 1,079.76

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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.