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Finding the Fourth Proportional to 603,792.30, 905,688.45 and 391,215.90

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Solution

The fourth proportional to 603,792.30, 905,688.45 and 391,215.90 is: 586,823.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    603,792.30 : 905,688.45 = 391,215.90 : x
  2. Step 2: Convert to fraction form
    603,792.30/905,688.45 = 391,215.90/x
  3. Step 3: Cross multiply
    603,792.30x = 905,688.45 × 391,215.90
  4. Step 4: Simplify right side
    603,792.30x = 354,319,722,086.36
  5. Step 5: Solve for x
    x = 354,319,722,086.36/603,792.30
  6. Step 6: Final answer
    x = 586,823.85

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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.