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Finding the Fourth Proportional to 20,870.68, 31,305.64 and 7,019.68

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Solution

The fourth proportional to 20,870.68, 31,305.64 and 7,019.68 is: 10,529.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.68 : 31,305.64 = 7,019.68 : x
  2. Step 2: Convert to fraction form
    20,870.68/31,305.64 = 7,019.68/x
  3. Step 3: Cross multiply
    20,870.68x = 31,305.64 × 7,019.68
  4. Step 4: Simplify right side
    20,870.68x = 219,755,575.00
  5. Step 5: Solve for x
    x = 219,755,575.00/20,870.68
  6. Step 6: Final answer
    x = 10,529.39

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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.