Home / 20,312.56-28,013.88-13,236.40

Finding the Fourth Proportional to 20,312.56, 28,013.88 and 13,236.40

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Solution

The fourth proportional to 20,312.56, 28,013.88 and 13,236.40 is: 18,254.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,312.56 : 28,013.88 = 13,236.40 : x
  2. Step 2: Convert to fraction form
    20,312.56/28,013.88 = 13,236.40/x
  3. Step 3: Cross multiply
    20,312.56x = 28,013.88 × 13,236.40
  4. Step 4: Simplify right side
    20,312.56x = 370,802,921.23
  5. Step 5: Solve for x
    x = 370,802,921.23/20,312.56
  6. Step 6: Final answer
    x = 18,254.86

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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.