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Finding the Fourth Proportional to 20,987.73, 31,483.08 and 6,947.19

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Solution

The fourth proportional to 20,987.73, 31,483.08 and 6,947.19 is: 10,421.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.73 : 31,483.08 = 6,947.19 : x
  2. Step 2: Convert to fraction form
    20,987.73/31,483.08 = 6,947.19/x
  3. Step 3: Cross multiply
    20,987.73x = 31,483.08 × 6,947.19
  4. Step 4: Simplify right side
    20,987.73x = 218,718,938.55
  5. Step 5: Solve for x
    x = 218,718,938.55/20,987.73
  6. Step 6: Final answer
    x = 10,421.28

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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.