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Finding the Fourth Proportional to 85,785.78, 128,536.41 and 60,701.49

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Solution

The fourth proportional to 85,785.78, 128,536.41 and 60,701.49 is: 90,951.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,785.78 : 128,536.41 = 60,701.49 : x
  2. Step 2: Convert to fraction form
    85,785.78/128,536.41 = 60,701.49/x
  3. Step 3: Cross multiply
    85,785.78x = 128,536.41 × 60,701.49
  4. Step 4: Simplify right side
    85,785.78x = 7,802,351,606.25
  5. Step 5: Solve for x
    x = 7,802,351,606.25/85,785.78
  6. Step 6: Final answer
    x = 90,951.57

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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.