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Finding the Fourth Proportional to 679,984.48, 938,411.84 and 378,172

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Solution

The fourth proportional to 679,984.48, 938,411.84 and 378,172 is: 521,895.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,984.48 : 938,411.84 = 378,172 : x
  2. Step 2: Convert to fraction form
    679,984.48/938,411.84 = 378,172/x
  3. Step 3: Cross multiply
    679,984.48x = 938,411.84 × 378,172
  4. Step 4: Simplify right side
    679,984.48x = 354,881,082,356.48
  5. Step 5: Solve for x
    x = 354,881,082,356.48/679,984.48
  6. Step 6: Final answer
    x = 521,895.86

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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.