Home / 3,123.40-4,685.10-2,885.80

Finding the Fourth Proportional to 3,123.40, 4,685.10 and 2,885.80

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Solution

The fourth proportional to 3,123.40, 4,685.10 and 2,885.80 is: 4,328.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,123.40 : 4,685.10 = 2,885.80 : x
  2. Step 2: Convert to fraction form
    3,123.40/4,685.10 = 2,885.80/x
  3. Step 3: Cross multiply
    3,123.40x = 4,685.10 × 2,885.80
  4. Step 4: Simplify right side
    3,123.40x = 13,520,261.58
  5. Step 5: Solve for x
    x = 13,520,261.58/3,123.40
  6. Step 6: Final answer
    x = 4,328.70

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Double scale
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Similar ratio
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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.