Home / 1,218.31-1,681.19-687.27

Finding the Fourth Proportional to 1,218.31, 1,681.19 and 687.27

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Solution

The fourth proportional to 1,218.31, 1,681.19 and 687.27 is: 948.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.31 : 1,681.19 = 687.27 : x
  2. Step 2: Convert to fraction form
    1,218.31/1,681.19 = 687.27/x
  3. Step 3: Cross multiply
    1,218.31x = 1,681.19 × 687.27
  4. Step 4: Simplify right side
    1,218.31x = 1,155,436.90
  5. Step 5: Solve for x
    x = 1,155,436.90/1,218.31
  6. Step 6: Final answer
    x = 948.40

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1.5x scale

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.