Home / 20,897.81-31,345.90-5,315.84

Finding the Fourth Proportional to 20,897.81, 31,345.90 and 5,315.84

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Solution

The fourth proportional to 20,897.81, 31,345.90 and 5,315.84 is: 7,973.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,897.81 : 31,345.90 = 5,315.84 : x
  2. Step 2: Convert to fraction form
    20,897.81/31,345.90 = 5,315.84/x
  3. Step 3: Cross multiply
    20,897.81x = 31,345.90 × 5,315.84
  4. Step 4: Simplify right side
    20,897.81x = 166,629,619.04
  5. Step 5: Solve for x
    x = 166,629,619.04/20,897.81
  6. Step 6: Final answer
    x = 7,973.55

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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.