Home / 20,389.46-28,124.93-13,490.58

Finding the Fourth Proportional to 20,389.46, 28,124.93 and 13,490.58

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Solution

The fourth proportional to 20,389.46, 28,124.93 and 13,490.58 is: 18,608.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.46 : 28,124.93 = 13,490.58 : x
  2. Step 2: Convert to fraction form
    20,389.46/28,124.93 = 13,490.58/x
  3. Step 3: Cross multiply
    20,389.46x = 28,124.93 × 13,490.58
  4. Step 4: Simplify right side
    20,389.46x = 379,421,618.16
  5. Step 5: Solve for x
    x = 379,421,618.16/20,389.46
  6. Step 6: Final answer
    x = 18,608.71

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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.