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Finding the Fourth Proportional to 338,631.60, 508,141.80 and 128,420.40

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Solution

The fourth proportional to 338,631.60, 508,141.80 and 128,420.40 is: 192,704.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,631.60 : 508,141.80 = 128,420.40 : x
  2. Step 2: Convert to fraction form
    338,631.60/508,141.80 = 128,420.40/x
  3. Step 3: Cross multiply
    338,631.60x = 508,141.80 × 128,420.40
  4. Step 4: Simplify right side
    338,631.60x = 65,255,773,212.72
  5. Step 5: Solve for x
    x = 65,255,773,212.72/338,631.60
  6. Step 6: Final answer
    x = 192,704.32

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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.