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Finding the Fourth Proportional to 85,953.15, 128,301.57 and 79,621.79

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Solution

The fourth proportional to 85,953.15, 128,301.57 and 79,621.79 is: 118,850.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,953.15 : 128,301.57 = 79,621.79 : x
  2. Step 2: Convert to fraction form
    85,953.15/128,301.57 = 79,621.79/x
  3. Step 3: Cross multiply
    85,953.15x = 128,301.57 × 79,621.79
  4. Step 4: Simplify right side
    85,953.15x = 10,215,600,021.70
  5. Step 5: Solve for x
    x = 10,215,600,021.70/85,953.15
  6. Step 6: Final answer
    x = 118,850.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.