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Finding the Fourth Proportional to 1,218.46, 1,681.12 and 720.91

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Solution

The fourth proportional to 1,218.46, 1,681.12 and 720.91 is: 994.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.46 : 1,681.12 = 720.91 : x
  2. Step 2: Convert to fraction form
    1,218.46/1,681.12 = 720.91/x
  3. Step 3: Cross multiply
    1,218.46x = 1,681.12 × 720.91
  4. Step 4: Simplify right side
    1,218.46x = 1,211,936.22
  5. Step 5: Solve for x
    x = 1,211,936.22/1,218.46
  6. Step 6: Final answer
    x = 994.65

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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.