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Finding the Fourth Proportional to 70,090.71, 96,721.80 and 39,873.18

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Solution

The fourth proportional to 70,090.71, 96,721.80 and 39,873.18 is: 55,023.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,090.71 : 96,721.80 = 39,873.18 : x
  2. Step 2: Convert to fraction form
    70,090.71/96,721.80 = 39,873.18/x
  3. Step 3: Cross multiply
    70,090.71x = 96,721.80 × 39,873.18
  4. Step 4: Simplify right side
    70,090.71x = 3,856,605,954.51
  5. Step 5: Solve for x
    x = 3,856,605,954.51/70,090.71
  6. Step 6: Final answer
    x = 55,023.07

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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.