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Finding the Fourth Proportional to 20,978.40, 28,953.54 and 15,331.68

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Solution

The fourth proportional to 20,978.40, 28,953.54 and 15,331.68 is: 21,160.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.40 : 28,953.54 = 15,331.68 : x
  2. Step 2: Convert to fraction form
    20,978.40/28,953.54 = 15,331.68/x
  3. Step 3: Cross multiply
    20,978.40x = 28,953.54 × 15,331.68
  4. Step 4: Simplify right side
    20,978.40x = 443,906,410.15
  5. Step 5: Solve for x
    x = 443,906,410.15/20,978.40
  6. Step 6: Final answer
    x = 21,160.17

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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.