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Finding the Fourth Proportional to 1,387, 2,080.76 and 703

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Solution

The fourth proportional to 1,387, 2,080.76 and 703 is: 1,054.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 2,080.76 = 703 : x
  2. Step 2: Convert to fraction form
    1,387/2,080.76 = 703/x
  3. Step 3: Cross multiply
    1,387x = 2,080.76 × 703
  4. Step 4: Simplify right side
    1,387x = 1,462,774.28
  5. Step 5: Solve for x
    x = 1,462,774.28/1,387
  6. Step 6: Final answer
    x = 1,054.63

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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.