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Finding the Fourth Proportional to 328,445.40, 492,797.70 and 128,731.80

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Solution

The fourth proportional to 328,445.40, 492,797.70 and 128,731.80 is: 193,148.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,445.40 : 492,797.70 = 128,731.80 : x
  2. Step 2: Convert to fraction form
    328,445.40/492,797.70 = 128,731.80/x
  3. Step 3: Cross multiply
    328,445.40x = 492,797.70 × 128,731.80
  4. Step 4: Simplify right side
    328,445.40x = 63,438,734,956.86
  5. Step 5: Solve for x
    x = 63,438,734,956.86/328,445.40
  6. Step 6: Final answer
    x = 193,148.50

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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.