Home / 20,818.61-28,730.36-11,387.16

Finding the Fourth Proportional to 20,818.61, 28,730.36 and 11,387.16

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Solution

The fourth proportional to 20,818.61, 28,730.36 and 11,387.16 is: 15,714.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.61 : 28,730.36 = 11,387.16 : x
  2. Step 2: Convert to fraction form
    20,818.61/28,730.36 = 11,387.16/x
  3. Step 3: Cross multiply
    20,818.61x = 28,730.36 × 11,387.16
  4. Step 4: Simplify right side
    20,818.61x = 327,157,149.24
  5. Step 5: Solve for x
    x = 327,157,149.24/20,818.61
  6. Step 6: Final answer
    x = 15,714.65

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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.