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Finding the Fourth Proportional to 318,897.40, 478,173.30 and 131,927.80

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Solution

The fourth proportional to 318,897.40, 478,173.30 and 131,927.80 is: 197,820.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,897.40 : 478,173.30 = 131,927.80 : x
  2. Step 2: Convert to fraction form
    318,897.40/478,173.30 = 131,927.80/x
  3. Step 3: Cross multiply
    318,897.40x = 478,173.30 × 131,927.80
  4. Step 4: Simplify right side
    318,897.40x = 63,084,351,487.74
  5. Step 5: Solve for x
    x = 63,084,351,487.74/318,897.40
  6. Step 6: Final answer
    x = 197,820.21

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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.