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Finding the Fourth Proportional to 663,440.68, 915,513.60 and 376,921

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Solution

The fourth proportional to 663,440.68, 915,513.60 and 376,921 is: 520,131.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,440.68 : 915,513.60 = 376,921 : x
  2. Step 2: Convert to fraction form
    663,440.68/915,513.60 = 376,921/x
  3. Step 3: Cross multiply
    663,440.68x = 915,513.60 × 376,921
  4. Step 4: Simplify right side
    663,440.68x = 345,076,301,625.60
  5. Step 5: Solve for x
    x = 345,076,301,625.60/663,440.68
  6. Step 6: Final answer
    x = 520,131.36

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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.