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Finding the Fourth Proportional to 3,387, 4,674.24 and 1,990.20

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Solution

The fourth proportional to 3,387, 4,674.24 and 1,990.20 is: 2,746.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,387 : 4,674.24 = 1,990.20 : x
  2. Step 2: Convert to fraction form
    3,387/4,674.24 = 1,990.20/x
  3. Step 3: Cross multiply
    3,387x = 4,674.24 × 1,990.20
  4. Step 4: Simplify right side
    3,387x = 9,302,672.45
  5. Step 5: Solve for x
    x = 9,302,672.45/3,387
  6. Step 6: Final answer
    x = 2,746.58

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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.