Home / 20,916.78-28,865-12,423.08

Finding the Fourth Proportional to 20,916.78, 28,865 and 12,423.08

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Solution

The fourth proportional to 20,916.78, 28,865 and 12,423.08 is: 17,143.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.78 : 28,865 = 12,423.08 : x
  2. Step 2: Convert to fraction form
    20,916.78/28,865 = 12,423.08/x
  3. Step 3: Cross multiply
    20,916.78x = 28,865 × 12,423.08
  4. Step 4: Simplify right side
    20,916.78x = 358,592,204.20
  5. Step 5: Solve for x
    x = 358,592,204.20/20,916.78
  6. Step 6: Final answer
    x = 17,143.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.