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Finding the Fourth Proportional to 361,869.80, 542,415.90 and 137,143.40

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Solution

The fourth proportional to 361,869.80, 542,415.90 and 137,143.40 is: 205,567.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    361,869.80 : 542,415.90 = 137,143.40 : x
  2. Step 2: Convert to fraction form
    361,869.80/542,415.90 = 137,143.40/x
  3. Step 3: Cross multiply
    361,869.80x = 542,415.90 × 137,143.40
  4. Step 4: Simplify right side
    361,869.80x = 74,388,760,740.06
  5. Step 5: Solve for x
    x = 74,388,760,740.06/361,869.80
  6. Step 6: Final answer
    x = 205,567.75

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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.