Home / 20,389.28-28,125.28-12,823.68

Finding the Fourth Proportional to 20,389.28, 28,125.28 and 12,823.68

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Solution

The fourth proportional to 20,389.28, 28,125.28 and 12,823.68 is: 17,689.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.28 : 28,125.28 = 12,823.68 : x
  2. Step 2: Convert to fraction form
    20,389.28/28,125.28 = 12,823.68/x
  3. Step 3: Cross multiply
    20,389.28x = 28,125.28 × 12,823.68
  4. Step 4: Simplify right side
    20,389.28x = 360,669,590.63
  5. Step 5: Solve for x
    x = 360,669,590.63/20,389.28
  6. Step 6: Final answer
    x = 17,689.18

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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.