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Finding the Fourth Proportional to 190,347.71, 285,490.58 and 71,990.91

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Solution

The fourth proportional to 190,347.71, 285,490.58 and 71,990.91 is: 107,974.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    190,347.71 : 285,490.58 = 71,990.91 : x
  2. Step 2: Convert to fraction form
    190,347.71/285,490.58 = 71,990.91/x
  3. Step 3: Cross multiply
    190,347.71x = 285,490.58 × 71,990.91
  4. Step 4: Simplify right side
    190,347.71x = 20,552,726,290.67
  5. Step 5: Solve for x
    x = 20,552,726,290.67/190,347.71
  6. Step 6: Final answer
    x = 107,974.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.