Home / 20,988.93-31,483.71-5,406.57

Finding the Fourth Proportional to 20,988.93, 31,483.71 and 5,406.57

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Solution

The fourth proportional to 20,988.93, 31,483.71 and 5,406.57 is: 8,109.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.93 : 31,483.71 = 5,406.57 : x
  2. Step 2: Convert to fraction form
    20,988.93/31,483.71 = 5,406.57/x
  3. Step 3: Cross multiply
    20,988.93x = 31,483.71 × 5,406.57
  4. Step 4: Simplify right side
    20,988.93x = 170,218,881.97
  5. Step 5: Solve for x
    x = 170,218,881.97/20,988.93
  6. Step 6: Final answer
    x = 8,109.94

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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.