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Finding the Fourth Proportional to 39,875.51, 55,028.16 and 21,970.51

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Solution

The fourth proportional to 39,875.51, 55,028.16 and 21,970.51 is: 30,319.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,875.51 : 55,028.16 = 21,970.51 : x
  2. Step 2: Convert to fraction form
    39,875.51/55,028.16 = 21,970.51/x
  3. Step 3: Cross multiply
    39,875.51x = 55,028.16 × 21,970.51
  4. Step 4: Simplify right side
    39,875.51x = 1,208,996,663.97
  5. Step 5: Solve for x
    x = 1,208,996,663.97/39,875.51
  6. Step 6: Final answer
    x = 30,319.28

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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.