Home / 20,512.36-28,312.14-12,561.40

Finding the Fourth Proportional to 20,512.36, 28,312.14 and 12,561.40

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Solution

The fourth proportional to 20,512.36, 28,312.14 and 12,561.40 is: 17,337.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,512.36 : 28,312.14 = 12,561.40 : x
  2. Step 2: Convert to fraction form
    20,512.36/28,312.14 = 12,561.40/x
  3. Step 3: Cross multiply
    20,512.36x = 28,312.14 × 12,561.40
  4. Step 4: Simplify right side
    20,512.36x = 355,640,115.40
  5. Step 5: Solve for x
    x = 355,640,115.40/20,512.36
  6. Step 6: Final answer
    x = 17,337.84

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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.