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Finding the Fourth Proportional to 1,016.88, 1,403.08 and 623.20

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Solution

The fourth proportional to 1,016.88, 1,403.08 and 623.20 is: 859.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.88 : 1,403.08 = 623.20 : x
  2. Step 2: Convert to fraction form
    1,016.88/1,403.08 = 623.20/x
  3. Step 3: Cross multiply
    1,016.88x = 1,403.08 × 623.20
  4. Step 4: Simplify right side
    1,016.88x = 874,399.46
  5. Step 5: Solve for x
    x = 874,399.46/1,016.88
  6. Step 6: Final answer
    x = 859.88

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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.