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Finding the Fourth Proportional to 1,156.32, 1,734.70 and 386.76

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Solution

The fourth proportional to 1,156.32, 1,734.70 and 386.76 is: 580.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,156.32 : 1,734.70 = 386.76 : x
  2. Step 2: Convert to fraction form
    1,156.32/1,734.70 = 386.76/x
  3. Step 3: Cross multiply
    1,156.32x = 1,734.70 × 386.76
  4. Step 4: Simplify right side
    1,156.32x = 670,912.57
  5. Step 5: Solve for x
    x = 670,912.57/1,156.32
  6. Step 6: Final answer
    x = 580.21

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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.