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Finding the Fourth Proportional to 20,643.52, 30,981.72 and 7,499.68

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Solution

The fourth proportional to 20,643.52, 30,981.72 and 7,499.68 is: 11,255.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.52 : 30,981.72 = 7,499.68 : x
  2. Step 2: Convert to fraction form
    20,643.52/30,981.72 = 7,499.68/x
  3. Step 3: Cross multiply
    20,643.52x = 30,981.72 × 7,499.68
  4. Step 4: Simplify right side
    20,643.52x = 232,352,985.85
  5. Step 5: Solve for x
    x = 232,352,985.85/20,643.52
  6. Step 6: Final answer
    x = 11,255.49

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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.