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Finding the Fourth Proportional to 4,230.80, 6,346.20 and 3,987.80

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Solution

The fourth proportional to 4,230.80, 6,346.20 and 3,987.80 is: 5,981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,230.80 : 6,346.20 = 3,987.80 : x
  2. Step 2: Convert to fraction form
    4,230.80/6,346.20 = 3,987.80/x
  3. Step 3: Cross multiply
    4,230.80x = 6,346.20 × 3,987.80
  4. Step 4: Simplify right side
    4,230.80x = 25,307,376.36
  5. Step 5: Solve for x
    x = 25,307,376.36/4,230.80
  6. Step 6: Final answer
    x = 5,981.70

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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.