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Finding the Fourth Proportional to 38,969.51, 53,775.90 and 21,973.28

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Solution

The fourth proportional to 38,969.51, 53,775.90 and 21,973.28 is: 30,321.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,969.51 : 53,775.90 = 21,973.28 : x
  2. Step 2: Convert to fraction form
    38,969.51/53,775.90 = 21,973.28/x
  3. Step 3: Cross multiply
    38,969.51x = 53,775.90 × 21,973.28
  4. Step 4: Simplify right side
    38,969.51x = 1,181,632,639.07
  5. Step 5: Solve for x
    x = 1,181,632,639.07/38,969.51
  6. Step 6: Final answer
    x = 30,321.98

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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.