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Finding the Fourth Proportional to 338,984.96, 508,611.20 and 128,678.72

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Solution

The fourth proportional to 338,984.96, 508,611.20 and 128,678.72 is: 193,068.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,984.96 : 508,611.20 = 128,678.72 : x
  2. Step 2: Convert to fraction form
    338,984.96/508,611.20 = 128,678.72/x
  3. Step 3: Cross multiply
    338,984.96x = 508,611.20 × 128,678.72
  4. Step 4: Simplify right side
    338,984.96x = 65,447,438,193.66
  5. Step 5: Solve for x
    x = 65,447,438,193.66/338,984.96
  6. Step 6: Final answer
    x = 193,068.86

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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.