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Finding the Fourth Proportional to 2,031.30, 3,045.40 and 643.84

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Solution

The fourth proportional to 2,031.30, 3,045.40 and 643.84 is: 965.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,031.30 : 3,045.40 = 643.84 : x
  2. Step 2: Convert to fraction form
    2,031.30/3,045.40 = 643.84/x
  3. Step 3: Cross multiply
    2,031.30x = 3,045.40 × 643.84
  4. Step 4: Simplify right side
    2,031.30x = 1,960,735.11
  5. Step 5: Solve for x
    x = 1,960,735.11/2,031.30
  6. Step 6: Final answer
    x = 965.26

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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.