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Finding the Fourth Proportional to 386,329.40, 578,802.90 and 331,033.40

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Solution

The fourth proportional to 386,329.40, 578,802.90 and 331,033.40 is: 495,957.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,329.40 : 578,802.90 = 331,033.40 : x
  2. Step 2: Convert to fraction form
    386,329.40/578,802.90 = 331,033.40/x
  3. Step 3: Cross multiply
    386,329.40x = 578,802.90 × 331,033.40
  4. Step 4: Simplify right side
    386,329.40x = 191,603,091,916.86
  5. Step 5: Solve for x
    x = 191,603,091,916.86/386,329.40
  6. Step 6: Final answer
    x = 495,957.83

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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.