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Finding the Fourth Proportional to 611,861.40, 917,792.10 and 387,475.20

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Solution

The fourth proportional to 611,861.40, 917,792.10 and 387,475.20 is: 581,212.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,861.40 : 917,792.10 = 387,475.20 : x
  2. Step 2: Convert to fraction form
    611,861.40/917,792.10 = 387,475.20/x
  3. Step 3: Cross multiply
    611,861.40x = 917,792.10 × 387,475.20
  4. Step 4: Simplify right side
    611,861.40x = 355,621,677,505.92
  5. Step 5: Solve for x
    x = 355,621,677,505.92/611,861.40
  6. Step 6: Final answer
    x = 581,212.80

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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.