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Finding the Fourth Proportional to 20,398.51, 30,591.88 and 5,607.91

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Solution

The fourth proportional to 20,398.51, 30,591.88 and 5,607.91 is: 8,410.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.51 : 30,591.88 = 5,607.91 : x
  2. Step 2: Convert to fraction form
    20,398.51/30,591.88 = 5,607.91/x
  3. Step 3: Cross multiply
    20,398.51x = 30,591.88 × 5,607.91
  4. Step 4: Simplify right side
    20,398.51x = 171,556,509.77
  5. Step 5: Solve for x
    x = 171,556,509.77/20,398.51
  6. Step 6: Final answer
    x = 8,410.25

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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.