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Finding the Fourth Proportional to 20,978.58, 28,953.27 and 19,207.02

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Solution

The fourth proportional to 20,978.58, 28,953.27 and 19,207.02 is: 26,508.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.58 : 28,953.27 = 19,207.02 : x
  2. Step 2: Convert to fraction form
    20,978.58/28,953.27 = 19,207.02/x
  3. Step 3: Cross multiply
    20,978.58x = 28,953.27 × 19,207.02
  4. Step 4: Simplify right side
    20,978.58x = 556,106,035.96
  5. Step 5: Solve for x
    x = 556,106,035.96/20,978.58
  6. Step 6: Final answer
    x = 26,508.28

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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.