Home / 20,377.90-28,121.48-12,420.10

Finding the Fourth Proportional to 20,377.90, 28,121.48 and 12,420.10

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Solution

The fourth proportional to 20,377.90, 28,121.48 and 12,420.10 is: 17,139.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,377.90 : 28,121.48 = 12,420.10 : x
  2. Step 2: Convert to fraction form
    20,377.90/28,121.48 = 12,420.10/x
  3. Step 3: Cross multiply
    20,377.90x = 28,121.48 × 12,420.10
  4. Step 4: Simplify right side
    20,377.90x = 349,271,593.75
  5. Step 5: Solve for x
    x = 349,271,593.75/20,377.90
  6. Step 6: Final answer
    x = 17,139.72

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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.