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Finding the Fourth Proportional to 30,830.61, 46,244.01 and 18,986.64

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Solution

The fourth proportional to 30,830.61, 46,244.01 and 18,986.64 is: 28,478.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,830.61 : 46,244.01 = 18,986.64 : x
  2. Step 2: Convert to fraction form
    30,830.61/46,244.01 = 18,986.64/x
  3. Step 3: Cross multiply
    30,830.61x = 46,244.01 × 18,986.64
  4. Step 4: Simplify right side
    30,830.61x = 878,018,370.03
  5. Step 5: Solve for x
    x = 878,018,370.03/30,830.61
  6. Step 6: Final answer
    x = 28,478.79

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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.