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Finding the Fourth Proportional to 1,016.95, 1,403.30 and 623.90

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Solution

The fourth proportional to 1,016.95, 1,403.30 and 623.90 is: 860.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.95 : 1,403.30 = 623.90 : x
  2. Step 2: Convert to fraction form
    1,016.95/1,403.30 = 623.90/x
  3. Step 3: Cross multiply
    1,016.95x = 1,403.30 × 623.90
  4. Step 4: Simplify right side
    1,016.95x = 875,513.41
  5. Step 5: Solve for x
    x = 875,513.41/1,016.95
  6. Step 6: Final answer
    x = 860.92

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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.