Home / 20,898.16-31,346.76-5,315.80

Finding the Fourth Proportional to 20,898.16, 31,346.76 and 5,315.80

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Solution

The fourth proportional to 20,898.16, 31,346.76 and 5,315.80 is: 7,973.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,898.16 : 31,346.76 = 5,315.80 : x
  2. Step 2: Convert to fraction form
    20,898.16/31,346.76 = 5,315.80/x
  3. Step 3: Cross multiply
    20,898.16x = 31,346.76 × 5,315.80
  4. Step 4: Simplify right side
    20,898.16x = 166,633,106.81
  5. Step 5: Solve for x
    x = 166,633,106.81/20,898.16
  6. Step 6: Final answer
    x = 7,973.58

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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.