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Finding the Fourth Proportional to 279,989.90, 386,386.44 and 152,665.49

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Solution

The fourth proportional to 279,989.90, 386,386.44 and 152,665.49 is: 210,678.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,989.90 : 386,386.44 = 152,665.49 : x
  2. Step 2: Convert to fraction form
    279,989.90/386,386.44 = 152,665.49/x
  3. Step 3: Cross multiply
    279,989.90x = 386,386.44 × 152,665.49
  4. Step 4: Simplify right side
    279,989.90x = 58,987,873,260.02
  5. Step 5: Solve for x
    x = 58,987,873,260.02/279,989.90
  6. Step 6: Final answer
    x = 210,678.58

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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.