Home / 20,840.12-31,263.42-6,985.88

Finding the Fourth Proportional to 20,840.12, 31,263.42 and 6,985.88

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Solution

The fourth proportional to 20,840.12, 31,263.42 and 6,985.88 is: 10,479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.12 : 31,263.42 = 6,985.88 : x
  2. Step 2: Convert to fraction form
    20,840.12/31,263.42 = 6,985.88/x
  3. Step 3: Cross multiply
    20,840.12x = 31,263.42 × 6,985.88
  4. Step 4: Simplify right side
    20,840.12x = 218,402,344.19
  5. Step 5: Solve for x
    x = 218,402,344.19/20,840.12
  6. Step 6: Final answer
    x = 10,479.90

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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.