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Finding the Fourth Proportional to 1,225.80, 1,690.20 and 930.96

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Solution

The fourth proportional to 1,225.80, 1,690.20 and 930.96 is: 1,283.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.80 : 1,690.20 = 930.96 : x
  2. Step 2: Convert to fraction form
    1,225.80/1,690.20 = 930.96/x
  3. Step 3: Cross multiply
    1,225.80x = 1,690.20 × 930.96
  4. Step 4: Simplify right side
    1,225.80x = 1,573,508.59
  5. Step 5: Solve for x
    x = 1,573,508.59/1,225.80
  6. Step 6: Final answer
    x = 1,283.66

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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.