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Finding the Fourth Proportional to 1,354.55, 2,031.88 and 430.09

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Solution

The fourth proportional to 1,354.55, 2,031.88 and 430.09 is: 645.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.55 : 2,031.88 = 430.09 : x
  2. Step 2: Convert to fraction form
    1,354.55/2,031.88 = 430.09/x
  3. Step 3: Cross multiply
    1,354.55x = 2,031.88 × 430.09
  4. Step 4: Simplify right side
    1,354.55x = 873,885.11
  5. Step 5: Solve for x
    x = 873,885.11/1,354.55
  6. Step 6: Final answer
    x = 645.15

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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.