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Finding the Fourth Proportional to 1,218.26, 1,681.20 and 694.32

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Solution

The fourth proportional to 1,218.26, 1,681.20 and 694.32 is: 958.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.26 : 1,681.20 = 694.32 : x
  2. Step 2: Convert to fraction form
    1,218.26/1,681.20 = 694.32/x
  3. Step 3: Cross multiply
    1,218.26x = 1,681.20 × 694.32
  4. Step 4: Simplify right side
    1,218.26x = 1,167,290.78
  5. Step 5: Solve for x
    x = 1,167,290.78/1,218.26
  6. Step 6: Final answer
    x = 958.17

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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.