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Finding the Fourth Proportional to 15,286.80, 21,078.81 and 10,802.82

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Solution

The fourth proportional to 15,286.80, 21,078.81 and 10,802.82 is: 14,895.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,286.80 : 21,078.81 = 10,802.82 : x
  2. Step 2: Convert to fraction form
    15,286.80/21,078.81 = 10,802.82/x
  3. Step 3: Cross multiply
    15,286.80x = 21,078.81 × 10,802.82
  4. Step 4: Simplify right side
    15,286.80x = 227,710,590.24
  5. Step 5: Solve for x
    x = 227,710,590.24/15,286.80
  6. Step 6: Final answer
    x = 14,895.90

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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.