Home / 3,905.68-5,385-3,156.88

Finding the Fourth Proportional to 3,905.68, 5,385 and 3,156.88

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Solution

The fourth proportional to 3,905.68, 5,385 and 3,156.88 is: 4,352.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.68 : 5,385 = 3,156.88 : x
  2. Step 2: Convert to fraction form
    3,905.68/5,385 = 3,156.88/x
  3. Step 3: Cross multiply
    3,905.68x = 5,385 × 3,156.88
  4. Step 4: Simplify right side
    3,905.68x = 16,999,798.80
  5. Step 5: Solve for x
    x = 16,999,798.80/3,905.68
  6. Step 6: Final answer
    x = 4,352.58

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1.5x scale

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.