Home / 15,678.72-21,636.88-8,605.80

Finding the Fourth Proportional to 15,678.72, 21,636.88 and 8,605.80

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Solution

The fourth proportional to 15,678.72, 21,636.88 and 8,605.80 is: 11,876.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678.72 : 21,636.88 = 8,605.80 : x
  2. Step 2: Convert to fraction form
    15,678.72/21,636.88 = 8,605.80/x
  3. Step 3: Cross multiply
    15,678.72x = 21,636.88 × 8,605.80
  4. Step 4: Simplify right side
    15,678.72x = 186,202,661.90
  5. Step 5: Solve for x
    x = 186,202,661.90/15,678.72
  6. Step 6: Final answer
    x = 11,876.14

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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.