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Finding the Fourth Proportional to 129,780.70, 194,671.05 and 79,698.40

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Solution

The fourth proportional to 129,780.70, 194,671.05 and 79,698.40 is: 119,547.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,780.70 : 194,671.05 = 79,698.40 : x
  2. Step 2: Convert to fraction form
    129,780.70/194,671.05 = 79,698.40/x
  3. Step 3: Cross multiply
    129,780.70x = 194,671.05 × 79,698.40
  4. Step 4: Simplify right side
    129,780.70x = 15,514,971,211.32
  5. Step 5: Solve for x
    x = 15,514,971,211.32/129,780.70
  6. Step 6: Final answer
    x = 119,547.60

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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.