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Finding the Fourth Proportional to 4,128.40, 5,766.80 and 4,128.40

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Solution

The fourth proportional to 4,128.40, 5,766.80 and 4,128.40 is: 5,766.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,128.40 : 5,766.80 = 4,128.40 : x
  2. Step 2: Convert to fraction form
    4,128.40/5,766.80 = 4,128.40/x
  3. Step 3: Cross multiply
    4,128.40x = 5,766.80 × 4,128.40
  4. Step 4: Simplify right side
    4,128.40x = 23,807,657.12
  5. Step 5: Solve for x
    x = 23,807,657.12/4,128.40
  6. Step 6: Final answer
    x = 5,766.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.