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Finding the Fourth Proportional to 1,218.14, 1,681.00 and 687.19

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Solution

The fourth proportional to 1,218.14, 1,681.00 and 687.19 is: 948.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.14 : 1,681.00 = 687.19 : x
  2. Step 2: Convert to fraction form
    1,218.14/1,681.00 = 687.19/x
  3. Step 3: Cross multiply
    1,218.14x = 1,681.00 × 687.19
  4. Step 4: Simplify right side
    1,218.14x = 1,155,154.55
  5. Step 5: Solve for x
    x = 1,155,154.55/1,218.14
  6. Step 6: Final answer
    x = 948.29

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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.