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Finding the Fourth Proportional to 4,858.40, 7,291.20 and 1,938.80

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Solution

The fourth proportional to 4,858.40, 7,291.20 and 1,938.80 is: 2,909.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,858.40 : 7,291.20 = 1,938.80 : x
  2. Step 2: Convert to fraction form
    4,858.40/7,291.20 = 1,938.80/x
  3. Step 3: Cross multiply
    4,858.40x = 7,291.20 × 1,938.80
  4. Step 4: Simplify right side
    4,858.40x = 14,136,178.56
  5. Step 5: Solve for x
    x = 14,136,178.56/4,858.40
  6. Step 6: Final answer
    x = 2,909.64

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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.