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Finding the Fourth Proportional to 1,120.80, 1,546.58 and 623.31

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Solution

The fourth proportional to 1,120.80, 1,546.58 and 623.31 is: 860.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.80 : 1,546.58 = 623.31 : x
  2. Step 2: Convert to fraction form
    1,120.80/1,546.58 = 623.31/x
  3. Step 3: Cross multiply
    1,120.80x = 1,546.58 × 623.31
  4. Step 4: Simplify right side
    1,120.80x = 963,995.66
  5. Step 5: Solve for x
    x = 963,995.66/1,120.80
  6. Step 6: Final answer
    x = 860.10

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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.