Home / 20,380.07-28,120.60-12,312.10

Finding the Fourth Proportional to 20,380.07, 28,120.60 and 12,312.10

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Solution

The fourth proportional to 20,380.07, 28,120.60 and 12,312.10 is: 16,988.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.07 : 28,120.60 = 12,312.10 : x
  2. Step 2: Convert to fraction form
    20,380.07/28,120.60 = 12,312.10/x
  3. Step 3: Cross multiply
    20,380.07x = 28,120.60 × 12,312.10
  4. Step 4: Simplify right side
    20,380.07x = 346,223,689.80
  5. Step 5: Solve for x
    x = 346,223,689.80/20,380.07
  6. Step 6: Final answer
    x = 16,988.34

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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.