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Finding the Fourth Proportional to 20,695.59, 31,019.08 and 9,578.80

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Solution

The fourth proportional to 20,695.59, 31,019.08 and 9,578.80 is: 14,356.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,695.59 : 31,019.08 = 9,578.80 : x
  2. Step 2: Convert to fraction form
    20,695.59/31,019.08 = 9,578.80/x
  3. Step 3: Cross multiply
    20,695.59x = 31,019.08 × 9,578.80
  4. Step 4: Simplify right side
    20,695.59x = 297,125,563.50
  5. Step 5: Solve for x
    x = 297,125,563.50/20,695.59
  6. Step 6: Final answer
    x = 14,356.95

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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.