Home / 20,507.12-28,312.12-13,445.86

Finding the Fourth Proportional to 20,507.12, 28,312.12 and 13,445.86

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Solution

The fourth proportional to 20,507.12, 28,312.12 and 13,445.86 is: 18,563.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,507.12 : 28,312.12 = 13,445.86 : x
  2. Step 2: Convert to fraction form
    20,507.12/28,312.12 = 13,445.86/x
  3. Step 3: Cross multiply
    20,507.12x = 28,312.12 × 13,445.86
  4. Step 4: Simplify right side
    20,507.12x = 380,680,801.82
  5. Step 5: Solve for x
    x = 380,680,801.82/20,507.12
  6. Step 6: Final answer
    x = 18,563.35

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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.