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Finding the Fourth Proportional to 21,987.71, 32,978.37 and 7,197.21

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Solution

The fourth proportional to 21,987.71, 32,978.37 and 7,197.21 is: 10,794.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.71 : 32,978.37 = 7,197.21 : x
  2. Step 2: Convert to fraction form
    21,987.71/32,978.37 = 7,197.21/x
  3. Step 3: Cross multiply
    21,987.71x = 32,978.37 × 7,197.21
  4. Step 4: Simplify right side
    21,987.71x = 237,352,254.35
  5. Step 5: Solve for x
    x = 237,352,254.35/21,987.71
  6. Step 6: Final answer
    x = 10,794.77

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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.