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Finding the Fourth Proportional to 387,628.43, 581,396.38 and 103,340.30

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Solution

The fourth proportional to 387,628.43, 581,396.38 and 103,340.30 is: 154,998.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,628.43 : 581,396.38 = 103,340.30 : x
  2. Step 2: Convert to fraction form
    387,628.43/581,396.38 = 103,340.30/x
  3. Step 3: Cross multiply
    387,628.43x = 581,396.38 × 103,340.30
  4. Step 4: Simplify right side
    387,628.43x = 60,081,676,328.11
  5. Step 5: Solve for x
    x = 60,081,676,328.11/387,628.43
  6. Step 6: Final answer
    x = 154,998.12

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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.