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Finding the Fourth Proportional to 1,019.18, 1,405.77 and 687.44

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Solution

The fourth proportional to 1,019.18, 1,405.77 and 687.44 is: 948.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.18 : 1,405.77 = 687.44 : x
  2. Step 2: Convert to fraction form
    1,019.18/1,405.77 = 687.44/x
  3. Step 3: Cross multiply
    1,019.18x = 1,405.77 × 687.44
  4. Step 4: Simplify right side
    1,019.18x = 966,382.53
  5. Step 5: Solve for x
    x = 966,382.53/1,019.18
  6. Step 6: Final answer
    x = 948.20

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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.