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Finding the Fourth Proportional to 20,980.58, 28,956.04 and 19,209.02

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Solution

The fourth proportional to 20,980.58, 28,956.04 and 19,209.02 is: 26,511.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.58 : 28,956.04 = 19,209.02 : x
  2. Step 2: Convert to fraction form
    20,980.58/28,956.04 = 19,209.02/x
  3. Step 3: Cross multiply
    20,980.58x = 28,956.04 × 19,209.02
  4. Step 4: Simplify right side
    20,980.58x = 556,217,151.48
  5. Step 5: Solve for x
    x = 556,217,151.48/20,980.58
  6. Step 6: Final answer
    x = 26,511.05

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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.