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Finding the Fourth Proportional to 1,145.62, 1,718.64 and 521.21

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Solution

The fourth proportional to 1,145.62, 1,718.64 and 521.21 is: 781.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.62 : 1,718.64 = 521.21 : x
  2. Step 2: Convert to fraction form
    1,145.62/1,718.64 = 521.21/x
  3. Step 3: Cross multiply
    1,145.62x = 1,718.64 × 521.21
  4. Step 4: Simplify right side
    1,145.62x = 895,772.35
  5. Step 5: Solve for x
    x = 895,772.35/1,145.62
  6. Step 6: Final answer
    x = 781.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.