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Finding the Fourth Proportional to 1,353.79, 2,031.03 and 379.90

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Solution

The fourth proportional to 1,353.79, 2,031.03 and 379.90 is: 569.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.79 : 2,031.03 = 379.90 : x
  2. Step 2: Convert to fraction form
    1,353.79/2,031.03 = 379.90/x
  3. Step 3: Cross multiply
    1,353.79x = 2,031.03 × 379.90
  4. Step 4: Simplify right side
    1,353.79x = 771,588.30
  5. Step 5: Solve for x
    x = 771,588.30/1,353.79
  6. Step 6: Final answer
    x = 569.95

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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.