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Finding the Fourth Proportional to 20,721.20, 31,081.80 and 18,712.40

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Solution

The fourth proportional to 20,721.20, 31,081.80 and 18,712.40 is: 28,068.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.20 : 31,081.80 = 18,712.40 : x
  2. Step 2: Convert to fraction form
    20,721.20/31,081.80 = 18,712.40/x
  3. Step 3: Cross multiply
    20,721.20x = 31,081.80 × 18,712.40
  4. Step 4: Simplify right side
    20,721.20x = 581,615,074.32
  5. Step 5: Solve for x
    x = 581,615,074.32/20,721.20
  6. Step 6: Final answer
    x = 28,068.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.