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Finding the Fourth Proportional to 1,381.34, 2,070.72 and 515

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Solution

The fourth proportional to 1,381.34, 2,070.72 and 515 is: 772.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.34 : 2,070.72 = 515 : x
  2. Step 2: Convert to fraction form
    1,381.34/2,070.72 = 515/x
  3. Step 3: Cross multiply
    1,381.34x = 2,070.72 × 515
  4. Step 4: Simplify right side
    1,381.34x = 1,066,420.80
  5. Step 5: Solve for x
    x = 1,066,420.80/1,381.34
  6. Step 6: Final answer
    x = 772.02

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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.