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Finding the Fourth Proportional to 488,364.80, 731,916.48 and 393,638.72

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Solution

The fourth proportional to 488,364.80, 731,916.48 and 393,638.72 is: 589,949.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    488,364.80 : 731,916.48 = 393,638.72 : x
  2. Step 2: Convert to fraction form
    488,364.80/731,916.48 = 393,638.72/x
  3. Step 3: Cross multiply
    488,364.80x = 731,916.48 × 393,638.72
  4. Step 4: Simplify right side
    488,364.80x = 288,110,666,334.11
  5. Step 5: Solve for x
    x = 288,110,666,334.11/488,364.80
  6. Step 6: Final answer
    x = 589,949.70

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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.