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Finding the Fourth Proportional to 1,380.64, 2,070.98 and 514.80

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Solution

The fourth proportional to 1,380.64, 2,070.98 and 514.80 is: 772.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.64 : 2,070.98 = 514.80 : x
  2. Step 2: Convert to fraction form
    1,380.64/2,070.98 = 514.80/x
  3. Step 3: Cross multiply
    1,380.64x = 2,070.98 × 514.80
  4. Step 4: Simplify right side
    1,380.64x = 1,066,140.50
  5. Step 5: Solve for x
    x = 1,066,140.50/1,380.64
  6. Step 6: Final answer
    x = 772.21

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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.