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Finding the Fourth Proportional to 86,671.70, 130,007.55 and 80,839.70

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Solution

The fourth proportional to 86,671.70, 130,007.55 and 80,839.70 is: 121,259.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,671.70 : 130,007.55 = 80,839.70 : x
  2. Step 2: Convert to fraction form
    86,671.70/130,007.55 = 80,839.70/x
  3. Step 3: Cross multiply
    86,671.70x = 130,007.55 × 80,839.70
  4. Step 4: Simplify right side
    86,671.70x = 10,509,771,339.74
  5. Step 5: Solve for x
    x = 10,509,771,339.74/86,671.70
  6. Step 6: Final answer
    x = 121,259.55

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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.