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Finding the Fourth Proportional to 1,372.86, 2,059.18 and 385.70

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Solution

The fourth proportional to 1,372.86, 2,059.18 and 385.70 is: 578.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.86 : 2,059.18 = 385.70 : x
  2. Step 2: Convert to fraction form
    1,372.86/2,059.18 = 385.70/x
  3. Step 3: Cross multiply
    1,372.86x = 2,059.18 × 385.70
  4. Step 4: Simplify right side
    1,372.86x = 794,214.47
  5. Step 5: Solve for x
    x = 794,214.47/1,372.86
  6. Step 6: Final answer
    x = 578.51

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1.5x scale

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.