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Finding the Fourth Proportional to 339,853.80, 509,780.70 and 256,909.80

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Solution

The fourth proportional to 339,853.80, 509,780.70 and 256,909.80 is: 385,364.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,853.80 : 509,780.70 = 256,909.80 : x
  2. Step 2: Convert to fraction form
    339,853.80/509,780.70 = 256,909.80/x
  3. Step 3: Cross multiply
    339,853.80x = 509,780.70 × 256,909.80
  4. Step 4: Simplify right side
    339,853.80x = 130,967,657,680.86
  5. Step 5: Solve for x
    x = 130,967,657,680.86/339,853.80
  6. Step 6: Final answer
    x = 385,364.70

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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.