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Finding the Fourth Proportional to 610,939.82, 915,217.72 and 399,938.06

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Solution

The fourth proportional to 610,939.82, 915,217.72 and 399,938.06 is: 599,126.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    610,939.82 : 915,217.72 = 399,938.06 : x
  2. Step 2: Convert to fraction form
    610,939.82/915,217.72 = 399,938.06/x
  3. Step 3: Cross multiply
    610,939.82x = 915,217.72 × 399,938.06
  4. Step 4: Simplify right side
    610,939.82x = 366,030,400,702.62
  5. Step 5: Solve for x
    x = 366,030,400,702.62/610,939.82
  6. Step 6: Final answer
    x = 599,126.77

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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.