Home / 20,900.19-31,309.80-13,005.81

Finding the Fourth Proportional to 20,900.19, 31,309.80 and 13,005.81

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Solution

The fourth proportional to 20,900.19, 31,309.80 and 13,005.81 is: 19,483.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.19 : 31,309.80 = 13,005.81 : x
  2. Step 2: Convert to fraction form
    20,900.19/31,309.80 = 13,005.81/x
  3. Step 3: Cross multiply
    20,900.19x = 31,309.80 × 13,005.81
  4. Step 4: Simplify right side
    20,900.19x = 407,209,309.94
  5. Step 5: Solve for x
    x = 407,209,309.94/20,900.19
  6. Step 6: Final answer
    x = 19,483.52

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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.