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Finding the Fourth Proportional to 1,381.08, 2,070.90 and 514.68

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Solution

The fourth proportional to 1,381.08, 2,070.90 and 514.68 is: 771.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.08 : 2,070.90 = 514.68 : x
  2. Step 2: Convert to fraction form
    1,381.08/2,070.90 = 514.68/x
  3. Step 3: Cross multiply
    1,381.08x = 2,070.90 × 514.68
  4. Step 4: Simplify right side
    1,381.08x = 1,065,850.81
  5. Step 5: Solve for x
    x = 1,065,850.81/1,381.08
  6. Step 6: Final answer
    x = 771.75

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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.