Home / 20,916.90-28,857.38-13,750.68

Finding the Fourth Proportional to 20,916.90, 28,857.38 and 13,750.68

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Solution

The fourth proportional to 20,916.90, 28,857.38 and 13,750.68 is: 18,970.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.90 : 28,857.38 = 13,750.68 : x
  2. Step 2: Convert to fraction form
    20,916.90/28,857.38 = 13,750.68/x
  3. Step 3: Cross multiply
    20,916.90x = 28,857.38 × 13,750.68
  4. Step 4: Simplify right side
    20,916.90x = 396,808,552.50
  5. Step 5: Solve for x
    x = 396,808,552.50/20,916.90
  6. Step 6: Final answer
    x = 18,970.72

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1.5x scale

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.