Home / 20,818.79-28,730.61-11,387.35

Finding the Fourth Proportional to 20,818.79, 28,730.61 and 11,387.35

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Solution

The fourth proportional to 20,818.79, 28,730.61 and 11,387.35 is: 15,714.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.79 : 28,730.61 = 11,387.35 : x
  2. Step 2: Convert to fraction form
    20,818.79/28,730.61 = 11,387.35/x
  3. Step 3: Cross multiply
    20,818.79x = 28,730.61 × 11,387.35
  4. Step 4: Simplify right side
    20,818.79x = 327,165,482.66
  5. Step 5: Solve for x
    x = 327,165,482.66/20,818.79
  6. Step 6: Final answer
    x = 15,714.91

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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.