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Finding the Fourth Proportional to 639,393.72, 958,737.40 and 402,228.96

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Solution

The fourth proportional to 639,393.72, 958,737.40 and 402,228.96 is: 603,121.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,393.72 : 958,737.40 = 402,228.96 : x
  2. Step 2: Convert to fraction form
    639,393.72/958,737.40 = 402,228.96/x
  3. Step 3: Cross multiply
    639,393.72x = 958,737.40 × 402,228.96
  4. Step 4: Simplify right side
    639,393.72x = 385,631,947,315.10
  5. Step 5: Solve for x
    x = 385,631,947,315.10/639,393.72
  6. Step 6: Final answer
    x = 603,121.26

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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.