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Finding the Fourth Proportional to 15,569.25, 21,485.57 and 9,980.25

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Solution

The fourth proportional to 15,569.25, 21,485.57 and 9,980.25 is: 13,772.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,569.25 : 21,485.57 = 9,980.25 : x
  2. Step 2: Convert to fraction form
    15,569.25/21,485.57 = 9,980.25/x
  3. Step 3: Cross multiply
    15,569.25x = 21,485.57 × 9,980.25
  4. Step 4: Simplify right side
    15,569.25x = 214,431,359.99
  5. Step 5: Solve for x
    x = 214,431,359.99/15,569.25
  6. Step 6: Final answer
    x = 13,772.75

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Similar ratio
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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.