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Finding the Fourth Proportional to 38,970.51, 53,777.28 and 21,974.28

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Solution

The fourth proportional to 38,970.51, 53,777.28 and 21,974.28 is: 30,323.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,970.51 : 53,777.28 = 21,974.28 : x
  2. Step 2: Convert to fraction form
    38,970.51/53,777.28 = 21,974.28/x
  3. Step 3: Cross multiply
    38,970.51x = 53,777.28 × 21,974.28
  4. Step 4: Simplify right side
    38,970.51x = 1,181,717,008.36
  5. Step 5: Solve for x
    x = 1,181,717,008.36/38,970.51
  6. Step 6: Final answer
    x = 30,323.37

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Double scale
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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.