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Finding the Fourth Proportional to 668,328.16, 921,884.32 and 396,213.76

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Solution

The fourth proportional to 668,328.16, 921,884.32 and 396,213.76 is: 546,532.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,328.16 : 921,884.32 = 396,213.76 : x
  2. Step 2: Convert to fraction form
    668,328.16/921,884.32 = 396,213.76/x
  3. Step 3: Cross multiply
    668,328.16x = 921,884.32 × 396,213.76
  4. Step 4: Simplify right side
    668,328.16x = 365,263,252,712.24
  5. Step 5: Solve for x
    x = 365,263,252,712.24/668,328.16
  6. Step 6: Final answer
    x = 546,532.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.