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Finding the Fourth Proportional to 15,585.89, 21,504.49 and 9,918.32

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Solution

The fourth proportional to 15,585.89, 21,504.49 and 9,918.32 is: 13,684.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,585.89 : 21,504.49 = 9,918.32 : x
  2. Step 2: Convert to fraction form
    15,585.89/21,504.49 = 9,918.32/x
  3. Step 3: Cross multiply
    15,585.89x = 21,504.49 × 9,918.32
  4. Step 4: Simplify right side
    15,585.89x = 213,288,280.94
  5. Step 5: Solve for x
    x = 213,288,280.94/15,585.89
  6. Step 6: Final answer
    x = 13,684.71

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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.