Home / 20,781.69-31,172.54-5,199.32

Finding the Fourth Proportional to 20,781.69, 31,172.54 and 5,199.32

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Solution

The fourth proportional to 20,781.69, 31,172.54 and 5,199.32 is: 7,798.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.69 : 31,172.54 = 5,199.32 : x
  2. Step 2: Convert to fraction form
    20,781.69/31,172.54 = 5,199.32/x
  3. Step 3: Cross multiply
    20,781.69x = 31,172.54 × 5,199.32
  4. Step 4: Simplify right side
    20,781.69x = 162,075,828.81
  5. Step 5: Solve for x
    x = 162,075,828.81/20,781.69
  6. Step 6: Final answer
    x = 7,798.97

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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.