Home / 20,916.86-31,381.43-8,430.47

Finding the Fourth Proportional to 20,916.86, 31,381.43 and 8,430.47

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Solution

The fourth proportional to 20,916.86, 31,381.43 and 8,430.47 is: 12,648.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.86 : 31,381.43 = 8,430.47 : x
  2. Step 2: Convert to fraction form
    20,916.86/31,381.43 = 8,430.47/x
  3. Step 3: Cross multiply
    20,916.86x = 31,381.43 × 8,430.47
  4. Step 4: Simplify right side
    20,916.86x = 264,560,204.17
  5. Step 5: Solve for x
    x = 264,560,204.17/20,916.86
  6. Step 6: Final answer
    x = 12,648.18

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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.