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Finding the Fourth Proportional to 1,381.15, 2,070.50 and 503.49

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Solution

The fourth proportional to 1,381.15, 2,070.50 and 503.49 is: 754.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.15 : 2,070.50 = 503.49 : x
  2. Step 2: Convert to fraction form
    1,381.15/2,070.50 = 503.49/x
  3. Step 3: Cross multiply
    1,381.15x = 2,070.50 × 503.49
  4. Step 4: Simplify right side
    1,381.15x = 1,042,463.18
  5. Step 5: Solve for x
    x = 1,042,463.18/1,381.15
  6. Step 6: Final answer
    x = 754.78

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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.