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Finding the Fourth Proportional to 419,121.57, 625,639.50 and 387,897.69

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Solution

The fourth proportional to 419,121.57, 625,639.50 and 387,897.69 is: 579,030.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,121.57 : 625,639.50 = 387,897.69 : x
  2. Step 2: Convert to fraction form
    419,121.57/625,639.50 = 387,897.69/x
  3. Step 3: Cross multiply
    419,121.57x = 625,639.50 × 387,897.69
  4. Step 4: Simplify right side
    419,121.57x = 242,684,116,822.76
  5. Step 5: Solve for x
    x = 242,684,116,822.76/419,121.57
  6. Step 6: Final answer
    x = 579,030.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.