Home / 20,387.21-28,135.29-12,735.01

Finding the Fourth Proportional to 20,387.21, 28,135.29 and 12,735.01

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Solution

The fourth proportional to 20,387.21, 28,135.29 and 12,735.01 is: 17,574.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.21 : 28,135.29 = 12,735.01 : x
  2. Step 2: Convert to fraction form
    20,387.21/28,135.29 = 12,735.01/x
  3. Step 3: Cross multiply
    20,387.21x = 28,135.29 × 12,735.01
  4. Step 4: Simplify right side
    20,387.21x = 358,303,234.67
  5. Step 5: Solve for x
    x = 358,303,234.67/20,387.21
  6. Step 6: Final answer
    x = 17,574.91

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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.