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Finding the Fourth Proportional to 394,328.40, 591,492.60 and 390,829.20

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Solution

The fourth proportional to 394,328.40, 591,492.60 and 390,829.20 is: 586,243.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,328.40 : 591,492.60 = 390,829.20 : x
  2. Step 2: Convert to fraction form
    394,328.40/591,492.60 = 390,829.20/x
  3. Step 3: Cross multiply
    394,328.40x = 591,492.60 × 390,829.20
  4. Step 4: Simplify right side
    394,328.40x = 231,172,579,663.92
  5. Step 5: Solve for x
    x = 231,172,579,663.92/394,328.40
  6. Step 6: Final answer
    x = 586,243.80

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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.