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Finding the Fourth Proportional to 339,140.88, 508,681.80 and 128,780.40

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Solution

The fourth proportional to 339,140.88, 508,681.80 and 128,780.40 is: 193,159.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,140.88 : 508,681.80 = 128,780.40 : x
  2. Step 2: Convert to fraction form
    339,140.88/508,681.80 = 128,780.40/x
  3. Step 3: Cross multiply
    339,140.88x = 508,681.80 × 128,780.40
  4. Step 4: Simplify right side
    339,140.88x = 65,508,245,676.72
  5. Step 5: Solve for x
    x = 65,508,245,676.72/339,140.88
  6. Step 6: Final answer
    x = 193,159.39

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1.5x scale

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.