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Finding the Fourth Proportional to 1,255, 1,731.90 and 703

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Solution

The fourth proportional to 1,255, 1,731.90 and 703 is: 970.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255 : 1,731.90 = 703 : x
  2. Step 2: Convert to fraction form
    1,255/1,731.90 = 703/x
  3. Step 3: Cross multiply
    1,255x = 1,731.90 × 703
  4. Step 4: Simplify right side
    1,255x = 1,217,525.70
  5. Step 5: Solve for x
    x = 1,217,525.70/1,255
  6. Step 6: Final answer
    x = 970.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.