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Finding the Fourth Proportional to 638,990.16, 881,647.92 and 421,174.68

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Solution

The fourth proportional to 638,990.16, 881,647.92 and 421,174.68 is: 581,116.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,990.16 : 881,647.92 = 421,174.68 : x
  2. Step 2: Convert to fraction form
    638,990.16/881,647.92 = 421,174.68/x
  3. Step 3: Cross multiply
    638,990.16x = 881,647.92 × 421,174.68
  4. Step 4: Simplify right side
    638,990.16x = 371,327,780,578.67
  5. Step 5: Solve for x
    x = 371,327,780,578.67/638,990.16
  6. Step 6: Final answer
    x = 581,116.59

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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.