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Finding the Fourth Proportional to 20,602.99, 28,417.62 and 19,917.15

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Solution

The fourth proportional to 20,602.99, 28,417.62 and 19,917.15 is: 27,471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,602.99 : 28,417.62 = 19,917.15 : x
  2. Step 2: Convert to fraction form
    20,602.99/28,417.62 = 19,917.15/x
  3. Step 3: Cross multiply
    20,602.99x = 28,417.62 × 19,917.15
  4. Step 4: Simplify right side
    20,602.99x = 565,998,000.18
  5. Step 5: Solve for x
    x = 565,998,000.18/20,602.99
  6. Step 6: Final answer
    x = 27,471.64

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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.