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Finding the Fourth Proportional to 4,684.32, 7,020 and 3,987.36

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Solution

The fourth proportional to 4,684.32, 7,020 and 3,987.36 is: 5,975.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,684.32 : 7,020 = 3,987.36 : x
  2. Step 2: Convert to fraction form
    4,684.32/7,020 = 3,987.36/x
  3. Step 3: Cross multiply
    4,684.32x = 7,020 × 3,987.36
  4. Step 4: Simplify right side
    4,684.32x = 27,991,267.20
  5. Step 5: Solve for x
    x = 27,991,267.20/4,684.32
  6. Step 6: Final answer
    x = 5,975.52

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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.