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Finding the Fourth Proportional to 545,861.90, 818,792.85 and 386,429.60

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Solution

The fourth proportional to 545,861.90, 818,792.85 and 386,429.60 is: 579,644.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,861.90 : 818,792.85 = 386,429.60 : x
  2. Step 2: Convert to fraction form
    545,861.90/818,792.85 = 386,429.60/x
  3. Step 3: Cross multiply
    545,861.90x = 818,792.85 × 386,429.60
  4. Step 4: Simplify right side
    545,861.90x = 316,405,793,508.36
  5. Step 5: Solve for x
    x = 316,405,793,508.36/545,861.90
  6. Step 6: Final answer
    x = 579,644.40

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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.