Home / 5,415.80-8,123.70-2,818.40

Finding the Fourth Proportional to 5,415.80, 8,123.70 and 2,818.40

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Solution

The fourth proportional to 5,415.80, 8,123.70 and 2,818.40 is: 4,227.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.80 : 8,123.70 = 2,818.40 : x
  2. Step 2: Convert to fraction form
    5,415.80/8,123.70 = 2,818.40/x
  3. Step 3: Cross multiply
    5,415.80x = 8,123.70 × 2,818.40
  4. Step 4: Simplify right side
    5,415.80x = 22,895,836.08
  5. Step 5: Solve for x
    x = 22,895,836.08/5,415.80
  6. Step 6: Final answer
    x = 4,227.60

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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.