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Finding the Fourth Proportional to 663,245.12, 915,018.45 and 408,153.44

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Solution

The fourth proportional to 663,245.12, 915,018.45 and 408,153.44 is: 563,091.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,245.12 : 915,018.45 = 408,153.44 : x
  2. Step 2: Convert to fraction form
    663,245.12/915,018.45 = 408,153.44/x
  3. Step 3: Cross multiply
    663,245.12x = 915,018.45 × 408,153.44
  4. Step 4: Simplify right side
    663,245.12x = 373,467,928,030.97
  5. Step 5: Solve for x
    x = 373,467,928,030.97/663,245.12
  6. Step 6: Final answer
    x = 563,091.86

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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.