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Finding the Fourth Proportional to 20,870.25, 31,305.38 and 7,019.25

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Solution

The fourth proportional to 20,870.25, 31,305.38 and 7,019.25 is: 10,528.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.25 : 31,305.38 = 7,019.25 : x
  2. Step 2: Convert to fraction form
    20,870.25/31,305.38 = 7,019.25/x
  3. Step 3: Cross multiply
    20,870.25x = 31,305.38 × 7,019.25
  4. Step 4: Simplify right side
    20,870.25x = 219,740,253.47
  5. Step 5: Solve for x
    x = 219,740,253.47/20,870.25
  6. Step 6: Final answer
    x = 10,528.88

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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.