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Finding the Fourth Proportional to 15,921.99, 21,970.71 and 9,954.32

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Solution

The fourth proportional to 15,921.99, 21,970.71 and 9,954.32 is: 13,735.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,921.99 : 21,970.71 = 9,954.32 : x
  2. Step 2: Convert to fraction form
    15,921.99/21,970.71 = 9,954.32/x
  3. Step 3: Cross multiply
    15,921.99x = 21,970.71 × 9,954.32
  4. Step 4: Simplify right side
    15,921.99x = 218,703,368.11
  5. Step 5: Solve for x
    x = 218,703,368.11/15,921.99
  6. Step 6: Final answer
    x = 13,735.93

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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.