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Finding the Fourth Proportional to 621,396.36, 931,448.16 and 421,732.98

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Solution

The fourth proportional to 621,396.36, 931,448.16 and 421,732.98 is: 632,160.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,396.36 : 931,448.16 = 421,732.98 : x
  2. Step 2: Convert to fraction form
    621,396.36/931,448.16 = 421,732.98/x
  3. Step 3: Cross multiply
    621,396.36x = 931,448.16 × 421,732.98
  4. Step 4: Simplify right side
    621,396.36x = 392,822,408,232.32
  5. Step 5: Solve for x
    x = 392,822,408,232.32/621,396.36
  6. Step 6: Final answer
    x = 632,160.78

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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.