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Finding the Fourth Proportional to 14,605.91, 20,156.18 and 7,891.55

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Solution

The fourth proportional to 14,605.91, 20,156.18 and 7,891.55 is: 10,890.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,605.91 : 20,156.18 = 7,891.55 : x
  2. Step 2: Convert to fraction form
    14,605.91/20,156.18 = 7,891.55/x
  3. Step 3: Cross multiply
    14,605.91x = 20,156.18 × 7,891.55
  4. Step 4: Simplify right side
    14,605.91x = 159,063,513.21
  5. Step 5: Solve for x
    x = 159,063,513.21/14,605.91
  6. Step 6: Final answer
    x = 10,890.35

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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.