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Finding the Fourth Proportional to 20,646.66, 28,479.54 and 17,188.42

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Solution

The fourth proportional to 20,646.66, 28,479.54 and 17,188.42 is: 23,709.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.66 : 28,479.54 = 17,188.42 : x
  2. Step 2: Convert to fraction form
    20,646.66/28,479.54 = 17,188.42/x
  3. Step 3: Cross multiply
    20,646.66x = 28,479.54 × 17,188.42
  4. Step 4: Simplify right side
    20,646.66x = 489,518,294.93
  5. Step 5: Solve for x
    x = 489,518,294.93/20,646.66
  6. Step 6: Final answer
    x = 23,709.32

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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.