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Finding the Fourth Proportional to 1,218.48, 1,681.34 and 687.37

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Solution

The fourth proportional to 1,218.48, 1,681.34 and 687.37 is: 948.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.48 : 1,681.34 = 687.37 : x
  2. Step 2: Convert to fraction form
    1,218.48/1,681.34 = 687.37/x
  3. Step 3: Cross multiply
    1,218.48x = 1,681.34 × 687.37
  4. Step 4: Simplify right side
    1,218.48x = 1,155,699.23
  5. Step 5: Solve for x
    x = 1,155,699.23/1,218.48
  6. Step 6: Final answer
    x = 948.47

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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.