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Finding the Fourth Proportional to 319,361.40, 478,869.30 and 132,391.80

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Solution

The fourth proportional to 319,361.40, 478,869.30 and 132,391.80 is: 198,516.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,361.40 : 478,869.30 = 132,391.80 : x
  2. Step 2: Convert to fraction form
    319,361.40/478,869.30 = 132,391.80/x
  3. Step 3: Cross multiply
    319,361.40x = 478,869.30 × 132,391.80
  4. Step 4: Simplify right side
    319,361.40x = 63,398,368,591.74
  5. Step 5: Solve for x
    x = 63,398,368,591.74/319,361.40
  6. Step 6: Final answer
    x = 198,516.07

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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.